If the pair of linear equations x – y = 1, x + ky = 5 has a unique solution x = 2, y = 1, then value of k is

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-3

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Solution

The correct option is B
3

Substitute the value of x and y in the equation x + ky = 5

put x = 2, y = 1

$\Rightarrow$ 2 + k(1) = 5

$\Rightarrow$ k = 5 - 2

$\Rightarrow$ k = 3

we get,k = 3

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