CBSE Class 10 Mathematics Pair Of Linear Equations In 2 Variables Worksheet Set H

Read and download free pdf of CBSE Class 10 Mathematics Pair Of Linear Equations In 2 Variables Worksheet Set H. Students and teachers of Class 10 Mathematics can get free printable Worksheets for Class 10 Mathematics Chapter 3 Linear Equations in PDF format prepared as per the latest syllabus and examination pattern in your schools. Class 10 students should practice questions and answers given here for Mathematics in Class 10 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 10 Mathematics Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems with solutions on daily basis to get more score in school exams and tests

Worksheet for Class 10 Mathematics Chapter 3 Linear Equations

Class 10 Mathematics students should refer to the following printable worksheet in Pdf for Chapter 3 Linear Equations in Class 10. This test paper with questions and answers for Class 10 will be very useful for exams and help you to score good marks

Class 10 Mathematics Worksheet for Chapter 3 Linear Equations

1. Solve graphically the system of linear equations: x + 3y = 11, 3x + 2y = 12 (3, 5)

2. Draw the graph of the equation x – y + 1 = 0 and 3x + 2y – 12 = 0. Determine the coordinates of the vertices of the triangle Formed by these lines and the x – axis, and shade the triangular region (-1, 0), (2, 3) and (4, 0)

3. Check graphically whether the pair of linear equations 4x – y – 8 = 0 and 2x – 3y + 6 = 0 is consistent. Also find the vertices of the triangle formed by these lines with the x - axis

4. Solve: a) x y = 1 , x y = 1

x + y 5 x – y 7 (x = -1, y = 1/6)

b) 149x – 330y = - 511, - 330x + 149y = - 32 (x=1, y=2)

c) 37x + 43y = 123, 43x + 37y = 117 (x=1, y=2)

d) (a – b) x + (a + b) y = a2 – 2ab – b2 , (a + b) x + (a + b) y = a2 + b2 (x = a +b, y = - 2ab/a +b)

e) a x – by = a2 + b2 , x – y = 2b ( a + b , a – b)

f) ax + by = a – b , bx – ay = a + b (x -1, y = -1)

g) 10 + 2 = 4 , 15 - 5 = - 2 (x = 3, y = 2)

x + y x - y x+ y x - y

h) x + y = a + b, x + y = 2 (a2, b2)

a b a2 b2

5. Find the value(s) of k for which the pair of linear equations k x + 3y = k – 2 and 12x + k y = k has no solution (k = ±6)

6. Find the value of k, for which the pair of equations 3x + 5y = 0, k x + 10y = 0, has a non zero solution (k = 6)

7. Find the value of a and b for which the system of equation has infinitely many solutions:

a) 2x + 3y = 7, (a – b) x + (a +b) y = 3a +b – 2 (5, 1)

8. Find the value of k, for which the given linear pair has a unique solution: 2x + 3y – 5 = 0, k x – 6y -8 = 0 (k ≠ -4)

9. 10 students of class x took part in mathematics quiz. If the number of girls is 4 more than the number of boys, find the number of boys and number of girls who took part in the quiz. (3, 7)

10. The larger of the two supplementary angles exceeds the smaller by 18 degrees. Find the angles (99˚, 81˚)

11. In a two digit number, the sum of the digits is 9. If the digits are reversed, the number is increased by 9. Find the number (45)

12. The sum of digits of a two digit numbers is 7. If the digits are reversed, the new number decreased by 2 equals twice the original Number.Find the number (25)

13. A fraction becomes 4/5 if 1 is added to both the numerator and the denominator. However, if 5 is subtracted from both numerator and the denominator the fraction becomes ½. Find the fraction (7/9)

14. Two years ago, a father was five times as old as his son. Two years later, his age will be 8 more than three times the age of the son. Find the present ages of father and son (10, 42)

15 90% and 97% pure acid solutions and mixed to obtain 21 litres of 95% pure acid solution. Find the amount of each Type of acid to be mixed to form the mixture (x=6, y=15)

16. 2 women and 5 men can together finished a piece of work in 4 days, while 3 women and 6 men can finis h it in 3 days. Find the time taken by 1 woman alone to finish the work, and that taken by 1 man alone. (18, 36)

17. A boat goes 16km upstream and 24km downstream in 6hrs. It can go 12km up and 36km down in the same time. Find the speed of the boat in still water and the speed of the stream. (8, 4)

18. Students of a class are made to stand in rows. If 4 students are extra in a row , their would be 2 rows less. If 4 students are less in a row, there would be 4 more rows. Find the number of students in the class. (96)

19. The perimeter of a rectangle is 44 cm. If its length is increased by 4 cm and its breadth is increased by 2cm, its area is increased by 72 sqcm. Find the dimensions of the rectangle. (12, 8)

20. The sum of two numbers is 1000 and the difference between their squares is 256000. Find the numbers (628, 372)

21. If (x + 2) is a factor of x3 + ax2 + 4bx + 12 and a + b = - 4, find the values of a and b (-3, -1)

22. Two numbers are in the ratio 3: 4 and if 4 are added to each, the ratio becomes 4:5. Find the numbers (12, 16)

23. The ratio of incomes of two persons is 9: 7 and the ratio of their expenditures is 4 : 3. If each of them saves Rs. 200 per Month, find their monthly expenditures. (Rs1800, Rs1400)

24. Sum of the areas of two squares is 468m2.If the difference of their perimeter is 24m, find the sides of two square (18, 12)

25. A boy travels for x hrs at 8km/hr and then for y hrs at 7km/hr. If he goes 37km altogether in 5hrs, find x and y (2, 3)

26. Places A and B are 100km apart on a highway. One car starts from A and another from B at the same time. If the cars travel in The same direction at different speeds, they meet in 5 hrs. If they travel towards each other they meet in 1 hour. What are the Speeds of the two cars

1. Solve graphically the system of linear equations: a) x + 3y = 11, 3x + 2y = 12 (3, 5)

2. Draw the graph of the equation x – y + 1 = 0 and 3x + 2y – 12 = 0. Determine the coordinates of the vertices of the triangle

Formed by these lines and the x – axis, and shade the triangular region (-1, 0), (2, 3) and (4, 0)

3. Solve: a) xy = 1 , xy = 1

x + y 5 x – y 7 (x = -1, y = 1/6)

b) 149x – 330y = - 511, - 330x + 149y = - 32 (x=1, y=2)

c) 37x + 43y = 123, 43x + 37y = 117 (x=1, y=2)

d) (a – b) x + (a + b) y = a2 – 2ab – b2 , (a + b) x + (a + b) y = a2 + b2 (x = a+b, y = - 2ab/a+b)

e) ax – by = a2 + b2 , x – y = 2b

f) 10 + 2 = 4 , 15 - 5 = - 2 (x = 3, y = 2)

x+ y x-y x+ y x - y

g) x + y = a + b, x + y = 2 (a2, b2)

a b a2 b2

4. Find the value(s) of k for which the pair of linear equations kx + 3y = k – 2 and 12x + ky = k has no solution (k = ±6)

5. Find the value of k, for which the pair of equations 3x + 5y = 0, kx + 10y = 0, has a non zero solution (k = 6)

6. Find the value of a and b for which the system of equation has infinitely many solutions:

a) 2x + 3y = 7, (a – b) x + (a +b) y = 3a +b – 2 (5, 1)

7. Find the value of k, for which the given linear pair has a unique solution: 2x + 3y – 5 = 0, kx – 6y -8 = 0 (k ≠ -4)

8. 10 students of class x took part in mathematics quiz. If the number of girls is 4 more than the number of boys, find the number of boys and number of girls who took part in the quiz. (3, 7)

9. The larger of the two supplementary angles exceeds the smaller by 18 degrees. Find the angles (99˚, 81˚)

10. In a two digit number, the sum of the digits is 9. If the digits are reversed, the number is increased by 9. Find the Number (45)

11. A fraction becomes 4/5 if 1 is added to both the numerator and the denominator. However, if 5 is subtracted from Both the numerator and the denominator the fraction becomes ½. Find the fraction (7/9)

12. Two years ago, a father was five times as old as his son. Two years later, his age will be 8 more than three times the age of the son. Find the present ages of father and son (10, 42)

13 90% and 97% pure acid solutions and mixed to obtain 21 litres of 95% pure acid solution. Find the amount of each Type of acid to be mixed to form the mixture (x=6, y=15)

14. 2 women and 5 men can together finished a piece of work in 4 days, while 3 women and 6 men can finis h it in 3 days. Find the time taken by 1 woman alone to finish the work, and that taken by 1 man alone. (18, 36)

15. A boat goes 16km upstream and 24km downstream in 6hrs. It can go 12km up and 36km down in the same time. Find the speed of the boat in still water and the speed of the stream. (8, 4)

16. Students of a class are made to stand in rows. If 4 students are extra in a row , their would be 2 rows less. If 4 students are less in a row, there would be 4 more rows. Find the number of students

17. The perimeter of a rectangle is 44 cm. If its length is increased by 4 cm and its breadth is increased by 2cm, its area is increased by 72 sqcm. Find the dimensions of the rectangle.

18. The sum of two numbers is 1000 and the difference between their squares is 256000. Find the numbers (266,744)

19. If (x + 2) is a factor of x3 + ax2 + 4bx + 12 and a + b = - 4, find the values of a and b (-3, -1)

20. Two numbers are in the ratio 3: 4 and if 4 are added to each, the ratio becomes 4:5. Find the numbers (12, 16)

21. Solve by the method of cross multiplication:

(a – b) x + (a + b) y = a2 – 2ab – b2, (a + b)(x+y) = a2 + b2 (a+b, -2ab/a+b)

22. The ratio of incomes of two persons is 9: 7 and the ratio of their expenditures is 4 : 3. If each of them saves Rs. 200 per Month, find their monthly expenditures. (Rs1800, Rs1400)

23. Sum of the areas of two squares is 468m2.If the difference of their perimeter is 24m, find the sides of two square

24. Rohan travels 600km from his home partly by train and partly by car. He takes eight hours if he travels 120km by train And rest by car. He takes 20min more if he travels 200km by train and rest by car. Find the speed of train and car. (60km/hr, 80km/hr)

25. A boy travels for x hrs at 8km/hr and then for y hrs at 7km/hr. If he goes 37km altogether in 5hrs, find x and y (2, 3)

Q.- Determine graphically the co-ordinates of the vertices of the triangle, the equations of whose sides are: y=x,3y=x, x+y=8

a. 13 sq. units
b. 21 sq. units
c. 11 sq. units
d. 12 sq. units
 
Ans- d. 12 sq. units

Explanation: y = x

 WT_PLE2V tests 1

 
Q.-  A system of two linear equations in two variables is consistent, if their graphs 
a. do not intersect at any point
b. coincide
c. cut the x – axis
d. intersect only at a point or they coincide with each other

Ans- d. intersect only at a point or they coincide with each other

Explanation: A system of two linear equations in two variables is consistent, if their graphs intersect only at a point, because it has a unique solution or they may coincide with each other giving infinite solutions.

 
Q.-  5 pencils and 7 pens together cost Rs.50 whereas 7 pencils and 5 pens together cost Rs.46.The cost of 1 pen is 
a. Rs. 5
b. Rs. 6
c. Rs. 3
d. Rs. 4
 
Ans-  a. Rs.5
 
Explanation: Let, cost(in RS) of one pencil = x
and cost (in RS) of one pen = y
Therefore , according to question
5x+7y = 50 ........ (1)
7x + 5y = 46 .........(2)
Multiply equation (1) by 7 and equation (2) by 5 we get
7(5x+7y)= 7 × 50
35x +49y = 350 .......(3)
and 5(7x +5y) = 5 × 46
35x +25y = 230 ....... (4)
Subtract equation (4) from equation 3 , we get
35x + 49y - 35x - 25y = 350 -230
49y -25y = 120
24y = 120
y = 120/24
y= 5
Substitute y = 5 in equation 1 , we get
5x + 7 5 =50
5x + 35 = 50
5x = 50 - 35
5x = 15
x = 15/5
x =3
Hence, Cost of One Pen = y =5
 
Q.-  The expenses of a lunch are partly constant and partly proportional to the number of guests. The expenses amount to Rs. 65 for 7 guests and Rs. 97 for 11 guests. How much the expenses for 18 guests will amount to?
 
Ans- Let the fixed expenses = Rs. x
and proportional charges = Rs. y
As per given condition
The expenses amount to Rs. 65 for 7 guests .
x + 7y = 65 ..(i)
And the expenses amount Rs. 97 for 11 guests.
So, x + 11y = 97 ..(ii)
Subtracting (i) from (ii), we get
4y = 32
y = 8
Put y = 8 eq. (i) , we get
x + 7(8) = 65
x = 9
Now, expenses for 18 guests
= x + 18y
= 9 + 18(8)
= 9 + 144 = Rs. 153
 
Q.-  Write the value of k for which the system of equations 3x + ky = 0, 2x - y = 0 has a unique solution. 
 
Ans-  The given equations are
3x + ky = 0 ........ (i)
2x - y = 0 ......... (ii)
We know that,
The system of linear equations is in the form of
a1x + b1y + c1 = 0
and a2x + b2y + c2 = 0
Compare (i) and (ii), we get
a1 = 3, b1 = k and c1 = 0
a2 = 2 , b2 = -1 and c2 = 0
The equations has a unique solution if a1/a2 ≠ b1/b2
So, 3/2 ≠ k/-1
k ≠ -3/2
Thus, k can take any real values except - 3/2.
 
Q.- Examine whether the solution set of the system of equations 3x – 4y = – 7; 3x – 4y = –9. Is consistent or inconsistent.
 
Ans- The given system of equation is :
3x - 4y = -7.........(1)
3x - 4y = -9..........(2)
Here, a1 = 3, b1 = -4, c1 = 7
a2 = 3, b2 = -4, c2 = 9
We see that a1/a= b1/b≠ c1/c2 
Hence, the lines represented by the given pair of linear equations are parallel. 
Therefore, equation (1) and (2) have no common solution,i.e., the solution set of the given  system equations is inconsistent.
 
Q.-One says, "Give me a hundred rupee, friend! I shall then become twice as rich as you are."
The other replies, "If you give me ten rupees, I shall be six times as rich as you are." Tell me how much money both have initially? 
 
Ans-  Suppose initially, they had Rs x and Rs. y with them respectively. as per condition given in the question, we obtain
x + 100 = 2(y - 100)
x + 100 = 2y - 200
x - 2y = -300 ...(i)
and 6(x - 10) = (y + 10)
6x - 60 = y + 10
6x - y = 70 .....(ii)
Multiplying equation (ii) by 2 & then subtracting eqeation (i) from it, we obtain:-
(12x - 2y)-(x - 2y) = 140 - (- 300 )
11x = 140 + 300
11x = 440
x = 40
Putting x = 40 in equation (i), we obtain
40 - 2y = -300
40 + 300 = 2y
2y = 340
y = 170
Therefore, initially they had Rs 40 and Rs 170 with them respectively.

LINEAR EQUATIONS IN TWO VARIABLES

Q.- Half the perimeter of a rectangular garden, whose length is 4 m more than its width, is 36 m. find the dimensions of the garden. 

Ans- Let the dimensions (i.e., length and width) of the garden be x and y m respectively.
Then, x = y + 4 and (2x + 2y) = 36
x - y = 4           ...(1)
x + y = 36        ...(2)
Let us draw the graphs of equations (1) and (2) by finding two solutions for each of the equations. These two solution of the equations (1) and (2) are given below in table 1 and table 2 respectively.
For equation (1)
x - y = 4
y = x - 4

 WT_PLE2V tests 2

We plot the points A(4, 0) and B(2, -2) on a graph paper and join these points to form the line AB representing. The equation (1) as shown in the figure.
Also, we plot the points C(20, 16) and D(16, 20) on the same graph paper and join these points to form the line CD representing the equation (2) as shown in the same figure.
WT_PLE2V tests 3
In the figure, we observe that the two lines intersect at the point C(20, 16) So x = 20, y = 16
is the required solution of the pair of linear equations formed. i.e., the dimensions of the garden are 20 m and 16 m.
Verification : substituting x = 20 and y = 16 in (1) and (2), we find that both the equations are satisfied as shown below:
20 - 16 = 4
20 + 16 = 36
This verifies the solution.
 
Q.-Half the perimeter of a rectangular garden, whose length is 4m more than its width is 36m. The area of the garden is 
a. 320 m2
b. 300 m2
c. 400 m2
d. 360 m2
 
Ans-  a. 320 m2
 
Explanation: Let the width be x.
then length be x+4
According to the question,
l+b=36
x+(x+4)=36
2x+4=36
2x=36-4
2x=32
x=16.
Hence, The length of the garden will be 20 m and width will be 16 m.
Area = length breath= 20 16 = 320 m2
 
Q.- If a pair of linear equation is consistent, then the lines will be 
a. always intersecting
b. intersecting or coincident
c. always coincident
d. parallel
 
Ans- b. intersecting or coincident
 
Explanation: If a consistent system has an infinite number of solutions, it is dependent. When you graph; the equations, both equations represent the same line. So for consistent line it has to be parallel or even they intersect at one
point. If a system has no solution, it is said to be inconsistent. The graphs of the lines do not intersect, so the graphs are parallel and there is no solution.
 
Q.- Find two numbers such that the sum of thrice the first and the second is 142, and four times the first exceeds the second by 138. 
 
Ans-  Let the first and second numbers be x and y respectively.
According to the given condition,
The sum of thrice the first and the second is 142.
3x + y = 142 ..........(i)
And as per second condition
Four times the first exceeds the second by 138
4x - y = 138.............(ii)
Adding (i) and (ii), we get
7x = 280
x=280/7=40
Putting x = 40 in (i), we get
3×40+y=142
y = 142 - 120
y = 22
Hence, the first and second numbers are 40 and 22.
 
Q.-A system of two linear equations in two variables has a unique solution, if their graphs 
a. do not intersect at any point
b. coincide
c. cut the x – axis
d. intersect only at a point
 
Ans- d. intersect only at a point
Explanation: Number of solutions of a system of two linear equations in two variables are equal to number of common points between the graphs of given linear equations.
If a system has unique solution then their graphs must intersect in only one poin
 
Q.- A system of two linear equations in two variables is inconsistent, if their graphs
a. intersect only at a point
b. coincide
c. do not intersect at any point
d. cut the x – axis
 
Ans- c. do not intersect at any point
Explanation: A system of two linear equations in two variables is inconsistent,if their graphs do not intersect at any point.
In this case, a pair of lines represented by the system are parallel to each other.
so they do not intersect each other at any point. the system is an inconsistent system of linear equations and the equations are independent.
 
Q.- Every linear equation in two variables has 
a. two solutions
b. no solution
c. an infinite number of solutions
d. one solution
 
Ans- c. an infinite number of solutions
Explanation: A linear equation in two variables is of the form, ax + by + c = 0,
where geometrically it does represent a straight line and every point on this graph is a solution for a given linear equation.
As a line consists of an infinite number of points,A linear equation has an infinite number of solutions
 
Q.- The difference between two numbers is 26 and one number is three times the other. Find the numbers. 
 
Ans-  Let the two numbers be x and y (x > y)
We are given that,
The difference between two numbers is 26.
x - y = 26                  ...(i)
And one number is three times the other.
x = 3y                       ...(ii)
On substituting the value x from eqn. (ii) in eqn. (i), we get
3y - y = 26
2y =26
y = 13
Put y = 13 in (ii) we get
x = 3(13) = 39
Hence, the two numbers are 39 and 13.
 
Q.- Draw the graph of the equation 3x + 2y = 12. Also, find the co-ordinates of the points where the line meets the x-axis and the y-axis. 
 
Ans-  3x + 2y = 12
y=12-3x/2
WT_PLE2V tests 4
Steps
i. Given equation.
ii. Write y in terms of x.
iii. Complete the table.
iv. Plot the points A(0, 6), B(2, 3) and C(4, 0) on the graph paper.
v. Join the points.
The Line meets the x-axis at (4, 0) and the y-axis at (0, 6).

WT_PLE2V tests 5

 More Question-

1) Find four solutions of the linear equation 5x – 4y = - 8

2) Find two solutions of the linear equation 2(x + 3) – 3(y + 1) = 0

3) Draw the graph of the linear equation 2x + 3y = 12. At what points the graph of the equation Cuts the x axis and the y axis

4) Draw the graphs of the equations x + y = 6 and 2x + 3y = 16on the same graph paper. Find the coordinates of the points where the two lines intersect

5) The auto rickshaw fare in a city is charged Rs 10 for the first km and Rs 4 per km for Subsequent distance covered. Write the linear equation to express the above statement Draw the graph of the linear equation

6) Check whether the graph of the linear equation 2x +3y = 12 passes through the point (1, 3)

7) If (2, 5) is a solution of the equation 2x + 3y = m, find the value of m (m= 19)

8) Frame a linear equations in the form ax + by + c = 0 by using the given values of a, b and c

a) a= -2, b =3, c= 4 b) a = 5, b= 0, c= -1

9) Find the value of k, if x = 2, y = 1 is a solution of the equation 2x + 3y = k (k = 7)

10) Give the geometric representation of (A) 3 x + 9 =0 as an equation in (a) one variable

(B) 2x +1= x - 4 (b) Two variable

11) Solve the equation 2x + 1 = x – 3 and represent the solution on the number line

12) Give the equation of two lines passing through (2, 14). How many more such lines are there and Why

13) Solve for x: a) (3 x + 2) / 7 + 4 (x + 1) / 5 = 2/3 (2x + 1) (x=4)
b) 8y + 21/4 = 3y + 7 (y = 7/20)

14) If present ages of son and father are expressed by x and y respectively and after ten years father Will be twice as old as his son. Write the relation between x and y

15) Does point (1, 3) lie on the line 3y = 2x + 8

16) If (2, 3) and (4, 0) lie on the graph of equation ax + by = 1. Find value of a and b.Plot the graph the equation obtained

17) Express the equation y = 2x + 3 in the standard form and find two solutions. Is (2, 3) it’s Solution?

18) Express y in terms of x from the equation 3x + 2y = 8 and check whether the points (4, -2) lies on the line.

19) write each of the following as an equation in two variables (in standard form):
(a) X = - 5 (b) y = 2 (c) 2x = 3 (d) 5y = 2

Pair of Linear Equations in Two Variables

Q.- The area of the triangle formed by y = x, x = 6 and y = 0 is 
a. 18 sq. units
b. 72 sq. units
c. 36 sq. units
d. 9 sq. units
 
Ans- a. 18 sq. units
Explanation: The triangle formed by the lines y = x, x = 6 and y = 0 is shaded.
The area of the shaded region, i.e.,x=y
We got a right-angled triangle with base 6 units and height 6 units
Triangle OAB = 1/2×OA×AB
Hence area of triangle =(1/2)×6×6 = 18 sq units
= 1/2×6×6= 18 sq.units
 
WT_PLE2V tests 6
5. A system of two linear equations in two variables is dependent consistent, if their graphs 
a. do not intersect at any point
b. cut the x – axis
c. intersect only at a point
d. coincide
 
Ans- d. coincide
 
Explanation: A system of two linear equations in two variables is dependent consistent, if their graphs coincide with each other i.e. they superimpose each other and all points in one line are also solution for the other line
 
Q.-  Find whether the pair of linear equations y = 0 and y = - 5 has no solution, unique solution or infinitely many solutions 
 
Ans- Since, given variable y has different values so, The pair of equations y=0 and y=-5 has no solution.
Both the lines y=0 and y=-5 are parallel to x-axis. Hence they do not have solution
 
Q.- A and B each have a certain number of mangoes. A says to B, "if you give 30 of your mangoes, I will have twice as many as left with you." B replies, "if you give me 10, I will have thrice as many as left with you." How many mangoes does each have? 
 
Ans-  Assume A has x mangoes and B has y mangoes.
As per given condition if B gives 30 then A will have twice as many as left by B.
(x + 30) = 2(y - 30)
x + 30 = 2y - 60
x = 2y - 90            ....(1)
And if A gives 10 mangoes to B, then B will have thrice as many as left by A.
3(x - 10) = (y + 10)
3x = y + 40 ....(2)
3(2y - 90) = y + 40 (using x from Eq. 1)
6y - 270 = y + 40
6y - y = 310
y = 62
Put y = 62 in (1)
So, x = 124 - 90 = 34
Therefore A has 34 mangoes and B has 62 mangoes.
 
Q.- Meena went to a bank to withdraw Rs.2000. She asked the cashier to give her Rs.50 and Rs.100 notes only. Meena got 25 notes in all. Find how many notes of Rs.50 and Rs.100 she received. 
 
Ans- Let the number of Rs. 50 notes and Rs. 100 notes be x and y respectively.
According to given condition,
Meena got 25 notes in all.
⇒ x + y = 25                       ...........(i)
and Meena withdraw Rs.2000.
⇒ 50x + 100y = 2000          ............(ii)
Multiplying equation (i) by 50, we obtain:
50x + 50y = 1250                 ............. (iii)
Subtracting equation (iii) from equation (ii), we obtain:
(50x + 100y ) - (50x + 50y) = 2000 - 1250
50x + 100y - 50x - 50y = 750
50y = 750
y = 15
Substituting the value of y in equation (i), we obtain:
x = 10
Hence, Meena received 10 notes of Rs. 50 and 15 notes of Rs. 100.
 
Q.-  Solve the system of equations: x - 2y = 0, 3x + 4y = 20. 
 
Ans- The given equations are
x - 2y = 0                 ...........(i)
3x + 4y = 20            ..........(ii)
Multiply (i) by 2, we get
2x - 4y = 0 ......... (iii)
Add (ii) and (iii), we get
5x = 20
x = 4
Put x = 4 in (i), we get
4 - 2y = 0
2y = 4
y = 2
So, x = 4 and y = 2 is the solution of given equations
 
Q.- The area of the triangle formed by 2x – y + 6 = 0, 4x + 5y – 16 = 0 and the x – axis is
a. 15 sq. units
b. 16 sq. units
c. 14 sq. units
d. 12 sq. units
 
Ans- c. 14 sq. units
 
Explanation: Here are the two solutions of each of the given equations

WT_PLE2V tests 7

 

More Question-

1.The solution of the system of equation and is √2x + √5y = 0 and √3x - √7y = 0 is 
(A) x = √3, y = √5
(B) x = √2, y = √7
(C) x = 1, y = √2
(D) x = 0, y = 0

2.If a pair of values x, y satisfies an equation, then x and y are called _____ of equation.

3.The ratio between a two-digit number and the sum of digits of that number is 4 : 1. If the digit in the unit place is 3 more than the digit in the tenth place, what is that number ?
(A) 63
(B) 36
(C) 24
(D) None of these.

4.If the ratio of boys to girls in a class is B and the ratio of girls to boys is G, then B + G is
(A) greater than 1 or equal to 1
(B) greater than 1
(C) less than 1
(D) equal to 1

5.The income of P and Q are in the ratio 3 : 2 and expenses are in the ratio of 5 : 3. If both saveRs 200, What is the income of P ?
(A) Rs 700
(B) Rs 1000
(C) Rs 1200
(D) None of these.

6.Which of the following system of equations has no solution?
(A) 3x + y = 2, 9x + 3y = 6
(B) 4x - 7y + 28 = 0, 5y - 7x + 9 = 0
(C) 3x - 5y - 11 = 0, 6x - 10y - 7 = 0
(D) None of these.

7.The LCM of two numbers is 630 and their HCF is 9. If the sum of the numbers is 153, their difference is
(A) 72
(B) 27
(C) 81
(D) 18

8.For the equations 5x - 6y = 2 and 10x = 12y + 7
(A) there is no solution
(B) there exists unique solution
(C) there are two solutions
(D) there are infinite number of solutions.

9. For what value of p does the system of equations 2x - py = 0, 3x + 4y = has nonzero solution?
(A) p = - 6
(B) p = (-8/3)
(C) p = (-2/3)
(D) p = -(3/8)

10.The sum of the digits of a two digits number is 8. If the digits are reversed, the number is decreased by 54. Find the number.
(A) 35
(B) 17
(C) 71
(D) 53.

11.For what value of p will the system of equations 3x + y = 1, (2p - 1)x + (p- 1)y = (2P + 1) has no solution?
(A) p = 2
(B) p ≠ 2
(C) p = - 2
(D) p ≠ - 2

12.For what value of k, the system of equations x + 2y = 3, 5x + ky + 7 = 0 has unique solution?
(A) k = 10
(B) All real values except 10
(C) All natural numbers except 10
(D) None of these.

13.For what value of k, the system of equations kx - y = 2, 6x - 2y = 3 has infinitely many solutions?
(A) k = 3
(B) k ≠ 4
(C) k = 6
(D) Does not exist.

14.For what values of a and b will the equations 2x + 3y = 7, (a - b)x + (a + b)y = (3a + b - 2) represent coincident lines?
(A) a = 5, b = - 1
(B) a = 5, b = 1
(C) a = -5, b = - 1
(D) a = 5, b = - 1

15.Divide 62 into two parts such that fourth part of the first and two-fifth part of the second are in the ratio 2 : 3.
(A) 24, 38
(B) 32, 30
(C) 16, 32
(D) 40, 22

16.37 pens and 53 pencils together cost Rs320, while 53 pens and 37 pencils together cost Rs400. Find the cost of pen and that of a pencil
(A) 6.50, 1.50
(B) 2.50, 1.00
(C) 4.50, 1.50
(D) 6.50, 2.50

17.Solve the following system of linear equation
2(ax - by) + (a + 4b) = 0
2(bx + ay) + (b - 4a) = 0
(A) x = 1, y = 2
(B) x = -1/2, y = 2
(C) x = 1/2 , y = -2
(D) None of these

18.If a1/a2 ≠ b1/b2 then a1x + b1y + c1 = 0 & a2x + b2y + c2 = 0 will represent ______line

19.The solution of the system of equations 2x -3y+4xy = 0 and 6x + 5y - 2xy = 0 is
(A) x = 0, y = 0
(B) x = 1, y = -2
(C) Both 'a' and 'b'
(D) None of these.

20.Which of the following system of equations is consistent?
(A) 3x - y = 1, 6x - 2y = 5
(B) 4x + 6y - 7 = 0, 12x + 18y - 21 = 0
(C) 4x + 7y = 3, 8x + 14 y = 7
(D) 6x + 2y = 3, 5x + 6y = - 2.

21.The coordinates of the point where the line 2(x - 3) = y - 8 meet the x-axis is
(A) (3, 0)
(B) (2, 0)
(C) (-1, 0)
(D) (0, -1)

22.The coordinates of the points where the lines 3x - y = 5, 6x - y = 10 meet the y-axis are
(A) (0, -5), (0, -10)
(B) (-5, 0), (10, 0)
(C) (5, 0), (0, -10)
(D) (0, -5), (0, -10)

23.Which of the following system of equations has infinitely many solutions?
(A) 5x - 4y = 20,  7.5x - 6y = 0
(B) 2x -3y = 5,  3x - 4.5y = 7.5
(C) x + 5y - 3 = 0,  3x + 15y - 9 = 0
(D) All of these.

24.A system of simultaneous linear equation is said to be consistent, if it has __________ solution.

25.If x/b = y/a, bx + ay = a2 + b2, then the values of (x, y) are
(A) (a, b)
(B) (-a, -b)
(C) (b, -a)
(D) (b, a).

26.A system of simultaneous linear equation is said to be ________ if it has no solution.

27.The coordinates of the points where the lines 5x - y = 7, 10x + y = 15 meet the y-axis
(A) (0, -7), (0, 15)
(B) (-7, 0), (15, 0)
(C) (7, 0), (0, -15)
(D) (0, -7), (0, -15)

28.If a1x + b1y + c1 = 0 & a2x +b2y + c2 = 0 then what will be the condition of consistency of infinite many solution ?

29.If a1/a2 = b1/b2 ≠ c1/c2 then what will be the condition of a1x + b1y + c1 = 0 & a2x +b2y + c2 = 0?

30.Sum of two numbers in 48 and their difference is 20. Find the numbers.

31.If the difference of two numbers is 26 and one number is three times the other, find the numbers

32.The sum of two numbers is 128 and their difference is 16. Find the number
(A) 70 , 52
(B) 72, 56
(C) 70 , 56
(D) 72 , 52

33.The solution of the system of equations 2x + 3y + 5 = 0 and 3x - 2y - 12 = 0 is _________
(A) x = - 3, y = - 2
(B) x = 2, y = - 3
(C) x = 3, y = - 2
(D) x = 12, y = 13

34.The solution of the system of equations 2x + 5y / xy = 6 and 4x - 5y / xy + 3 = 0 (where x ≠ 0, y ≠ 0) is
(A) x = 1, y = 2
(B) x = 0, y = 0
(C) x = - 1, y = 2
(D) x = 1, y = -2

35.Solve for x and y :
47x + 31y = 63
31x + 47y = 15
(A) x = -2, y = 1
(B) x = 2, y = -1
(C) x = 2, y = 1
(D) None of these

36.Solve (2u + v) = 7uv
3(u + 3v) = 11uv
(A) u = 0, v = 0
(B) u = 1, v = 3/2
(C) Both of these
(D) None of these

37.Solve:
x + 2y + z = 7
x + 3z = 11
2x - 3y = 1
(A) x = 1, y = 2, z = -1
(B) x = 2, y = 1,z = 3
(C) x = -1, y = -2, z = 1
(D) x = 3, y = 1, z= - 2

38.Solve x + y + 2z = 9
2x - y + 2z = 6
3x + y + 4z = 17
(A) x = 0,y = 1,z = 2
(B) x = -1,y = -2,z = -3
(C) x =1,y= 2, z = 3
(D) None of these

39.For what value of k, will the following system of equations x + 2y + 7 = 0, 2x + ky + 14 = 0 represent coincident lines
(A) 2
(B) 3
(C) 4
(D) 5

40.Solve: 4x + 6/y = 15
6x - 8/y = 14 and hence, find 'p' if y = px - 2.
(A) 3/4
(B) 1
(C) 0
(D) 4/3

41.Show that the following system of equations has unique.solution
2x - 3y = 6
x + y = 1
(A) Unique solution
(B) No solution
(C) Infinite
(D) None of these

42.For what value of k the following system of equations has a unique solution:
x - ky = 2
3x + 2y = -5
(A) k ≠ -2/5
(B) k ≠ -1/3
(C) k ≠ -2/3
(D) None of these

43.Solve 2x + 3y = 11 and 2x - 4y = -24 and hence find the value of 'm' for which y = mx + 3
(A) 1
(B) 2
(C) -2
(D) -1

44.The coordinates of the point where the line 5(x - 4) = 2y - 25 meet the x-axis
(A) (4, 0)
(B) (5, 0)
(C) (-1, 0)
(D) (0, -1)

45.The taxi charges in a city comprise of a fixed charge together with the charge for the distance covered. For a journey of 10 km the charge paid is Rs75 and for a journey of 15 km the charge paid is Rs110.What will a person have to pay for traveling a distance of 25 km.
(A) 220
(B) 240
(C) 200
(D) 180

46.Solve the following system by the method of elimination( substitution)
2x - y = 5
3x + 2y = 5
(A) x = 2, y = 1
(B) x = 1, y = 1
(C) x = 3, y = 1
(D) None of these

47.What number must be added to each of the number 5,9,17,27 to make the numbers in proportion?
(A) 4
(B) 5
(C) 6
(D) 3

48.The difference between two numbers is 26 and one number isthree times the other. Find them.
(A) 30, 13
(B) 35, 12
(C) 39, 31
(D) 39, 13

49.Find the value of k for which the following syatem of equation has no solutions:
2x + ky = 1; 3x - 5y = 7
(A) 0
(B) 10/3
(C) -(10/3)
(D) 1

50.For what value of k the following equations are inconsistent?
x - 4y = 6, 3x + ky = 5
(A)10
(B)12
(C)-12
(D)-10

51.The ratio of two persons is 9:7 and the ratio of their expenditure is 4:3. If each of them saves Rs 200 per month, find their monthly incomes
A) 1000,800
(B) 1800,1400
(C) 1600,1200
(D) 1600,1400

52.Solve the following system of equation by the method of cross-multiplication. 11x + 15y = -23
7x - 2y = 20
(A) x = 2, y = 2
(B) x = 3, y = -3
(C) x = 2, y = -3
(D) None of these

53.Solve the following system of linear equation by using the method of elimination by equating the coefficients.
√3x - √2y = √3
√5x + √3y = √2
(A) x = 5(√10 - 3), y = 5√15 - 8√6
(B) x = 5, y = 5
(C) x = 5(√10+3), y = 5 (√15 + 8 √6)
(D) The given equations are
√3x - √2y = √3
√5x + √3y = √2

54.For what value of p does the system of equations 4x - py = 0, 5x + 6y = 0 has nonzero solution?
(A) p = - 8
(B) p = -24/5
(C) p = -5/6
(D) p = -(3/8)

<3M>

55. (a) Solve:
217x + 131y = 913 =..(i)
131x + 217y = 827 ..(ii)
(b) For what value of the system of Equation
3x + 5y =0 
ux + 10y = 0 has unique solution

<6M>

56.The sum of a two - digit number and the number obtained by reversing the digits is 66. If the digits of the number differ by 2, find the number. How many such numbers are there?

57.Solve:
ax + by = a - b
bx - ay = a + b
By cross multiplication method.

58.A man has only 20 paise and 25 paise coins in his purse. If he has 50 coins in all totaling Rs 11.25 How many coins of each does he have?

59.On selling a tea set at 5% loss and a lemon set at 15% gain, a crockery seller gained Rs. 7.0 If he sells the tea set at 5% gain and the lemon set at 10% gain, the gain isRs 13. Find the actual price of the tea set and the lemon set.

60.A boat goes 30km upstream and 44km downstream is 10hrs. In 13 hrs it go 40km upstream and 55 km downstream. Determine the speed of the stream and that of boat in still water.

61. (a) Use elimination method to find all possible solutions of the following pair of equations.
2x + 3y = 8
4x + 6y = 7
(b) Determine the value on of ' u ' so that the following equations have no solutions.
(3u+1) x+3y - 2 = 0
(u2+1) x+(u-2)y - 5 = 0

62.a) The taxi charges in a city comprise of a fixed charge together with the charge for the distance covered. For a journey for 10km the charge paid is Rs 75 and for a journey of 15km the charge paid Rs 110. What will a person have to pay for traveling a distance of 25km.
(b) In ΔABC, ∠C = 3∠B = 2(∠A+∠B) Find the three angles.

63.Solve the given Equation by using the method of substitution.
2x+3y = 9
3x+4y = 5

64. Solve:
1/2x - 1/y = - 1
1/x + 1/2y = 8

65. Solve by cross multiplication, the following system of Equation:
x+y = 7
5x+12y = 7

66. Solve the following system of Equation -
8x - 3y = 5xy
6x - 5y = 2xy

67.a) For what value of 'u' will the following pair of Equation have infinitely many solutions.
ux+3y-(u-3) = 0
12x+uy - u = 0
(b) For what value of p does the pair of Equations given below has uniquesolution?
4x+py+8 = 0
2x+2y+2 = 0

68.A man sold a chair and a table together for Rs 1520 .There is a profit of 25% on the chair and 10% on table. By selling them together for Rs 1535, he could have made a profit of 10% on the chair and 25% on the table. Find the cost price of each.

69.Solve the given Equation by using the method of elimination by the coefficients:
x/10 + y/5 + 1 = 15
x/8 + y/6 = 15

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