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## Class 10 Maths MCQs Chapter 3 Pair of Linear Equations in Two Variables

1. A pair of linear equations a_{1}x + b_{1}y + c_{1} = 0; a_{2}x + b_{2}y + c_{2} = 0 is said to be inconsistent, if

**Answer**

Answer: b

2. Graphically, the pair of equations 7x – y = 5; 21x – 3y = 10 represents two lines which are

(a) intersecting at one point

(b) parallel

(c) intersecting at two points

(d) coincident

**Answer**

Answer: b

3. The pair of equations 3x – 5y = 7 and – 6x + 10y = 7 have

(a) a unique solution

(b) infinitely many solutions

(c) no solution

(d) two solutions

**Answer**

Answer: c

4. If a pair of linear equations is consistent, then the lines will be

(a) always coincident

(b) parallel

(c) always intersecting

(d) intersecting or coincident

**Answer**

Answer: d

5. The pair of equations x = 0 and x = 5 has

(a) no solution

(b) unique/one solution

(c) two solutions

(d) infinitely many solutions

**Answer**

Answer: c

6. The pair of equation x = – 4 and y = – 5 graphically represents lines which are

(a) intersecting at (- 5, – 4)

(b) intersecting at (- 4, – 5)

(c) intersecting at (5, 4)

(d) intersecting at (4, 5)

**Answer**

Answer: b

7. For what value of k, do the equations 2x – 3y + 10 = 0 and 3x + ky + 15 = 0 represent coincident lines

**Answer**

Answer: a

8. If the lines given by 2x + ky = 1 and 3x – 5y = 7 are parallel, then the value of k is

**Answer**

Answer: a

9. One equation of a pair of dependent linear equations is 2x + 5y = 3. The second equation will be

(a) 2x + 5y = 6

(b) 3x + 5y = 3

(c) -10x – 25y + 15 = 0

(d) 10x + 25y = 15

**Answer**

Answer: c

10. If x = a, y = b is the solution of the equations x + y = 5 and 2x – 3y = 4, then the values of a and b are respectively

(a) 6, -1

(b) 2, 3

(c) 1, 4

(d) 19/5, 6/5

**Answer**

Answer: d

11. The graph of x = -2 is a line parallel to the

(a) x-axis

(b) y-axis

(c) both x- and y-axis

(d) none of these

**Answer**

Answer: b

12. The graph of y = 4x is a line

(a) parallel to x-axis

(b) parallel to y-axis

(c) perpendicular to y-axis

(d) passing through the origin

**Answer**

Answer: d

13. The graph of y = 5 is a line parallel to the

(a) x-axis

(b) y-axis

(c) both axis

(d) none of these

**Answer**

Answer: a

14. Two equations in two variables taken together are called

(a) linear equations

(b) quadratic equations

(c) simultaneous equations

(d) none of these

**Answer**

Answer: c

15. If am bl then the system of equations ax + by = c, lx + my = n, has

(a) a unique solution

(b) no solution

(c) infinitely many solutions

(d) none of these

**Answer**

Answer: a

16. If in the equation x + 2y = 10, the value of y is 6, then the value of x will be

(a) -2

(b) 2

(c) 4

(d) 5

**Answer**

Answer: a

17. The graph of the equation 2x + 3y = 5 is a

(a) vertical line

(b) straight line

(c) horizontal line

(d) none of these

**Answer**

Answer: b

18. The value of k, for which equations 3x + 5y = 0 and kx + lOy = 0 has a non-zero solution is

(a) 6

(b) 0

(c) 2

(d) 5

**Answer**

Answer: a

19. The value of k, for which the system of equations x + (k + l)y = 5 and (k + l)x + 9y = 8k – 1 has infinitely many solutions is

(a) 2

(b) 3

(c) 4

(d) 5

**Answer**

Answer: a

20. The value of k for which the equations (3k + l)x + 3y = 2; (k2 + l)x + (k – 2)y = 5 has no solution, then k is equal to

(a) 2

(b) 3

(c) 1

(d) -1

**Answer**

Answer: d

21. The pair of equations x = a and y = b graphically represents lines which are

(a) parallel

(b) intersecting at (b, a)

(c) coincident

(d) intersecting at (a, b)

**Answer**

Answer: d

22. Asha has only ₹1 and ₹2 coins with her. If the total number of coins that she has is 50 and the amount of money with her is ₹75, then the number of ₹1 and ₹2 coins are, respectively

(a) 35 and 15

(b) 15 and 35

(c) 35 and 20

(d) 25 and 25

**Answer**

Answer: d

23. The father’s age is six times his son’s age. Four years hence, the age of the father will be four times his son’s age. The present ages of the son and the father are, respectively

(a) 4 and 24

(b) 5 and 30

(c) 6 and 36

(d) 3 and 24

**Answer**

Answer: c

24. The sum of the digits of a two-digit number is 9. If 27 is added to it, the digits of the number get reversed. The number is

(a) 27

(b) 72

(c) 45

(d) 36

**Answer**

Answer: d

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