If the pair of linear equations x – y = 1, x + ky = 5 has a unique s

1.	If the pair of linear equations x – y = 1, x + ky = 5 has a unique solution x = 2, y = 1 then the value of k is ……………A) -2 B) 3 C) 2 D) 4
Answer» Correct option is (B) 3 Given that x = 2, y = 1 is a solution of given system of equation. Put x = 2, y = 1 in equation x + ky = 5, we obtain 2 + k = 5 \(\Rightarrow\) k = 5 - 2 = 3 Correct option is B) 3

If the pair of linear equations x – y = 1, x + ky = 5 has a unique solution x = 2, y = 1 then the value of k is ……………A) -2 B) 3 C) 2 D) 4

Answer»

Correct option is (B) 3

Given that x = 2, y = 1 is a solution of given system of equation.

Put x = 2, y = 1 in equation x + ky = 5, we obtain

2 + k = 5

\(\Rightarrow\) k = 5 - 2 = 3

Correct option is B) 3