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RD Chapter 3- Pair of Linear Equations in Two Variables Ex-3.5 Interview Questions Answers

Question 1 : In each of the following systems of equations determine whether the system has a unique solution, no solution or infinitely many solutions. In case there is a unique solution, find it : (1 – 4)
x – 3y = 3
3x – 9y = 2 (C.B.S.E. 1994)

Answer 1 :


Question 2 :
2x + y = 5
4x + 2y = 10 (C.B.S.E. 1995C)

Answer 2 :


Question 3 :
3x – 5y = 20
6x – 10y = 40 (C.B.S.E. 1993)

Answer 3 :


Question 4 :
x – 2y = 8
5x – 10y = 10 (C.B.S.E. 1993)

Answer 4 :


Question 5 : Find the value of k for which the following system of equations has a unique solution: (5 – 8)
kx + 2y = 5
3x + y = 1 (C.B.S.E. 1990C, 92C)

Answer 5 :


Question 6 :
4x + ky + 8 = 0
2x + 2y + 2 = 0 [NCERT]

Answer 6 :


Question 7 :
4x – 5y = k
2x – 3y = 12

Answer 7 :


Question 8 :
x + 2y = 3
5x + ky + 7 = 0

Answer 8 :


Question 9 : Find the value of k for which each of the following systems of equations have infinitely many solution : (9 – 19)
2x + 3y – 5 = 0
6x + ky – 15 = 0 (C.B.S.E. 1991)

Answer 9 :


Question 10 :
4x + 5y = 3
kx + 15y = 9 (C.B.S.E. 1990C)

Answer 10 :



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