Find the value of k such that $x = 2$ and $y = 1$ is a solution of the linear equation $2 x - k y + 7 = 8.$

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Solution

Consider the given equation,

$2 x - k y + 7 = 8$ and $x = 2, y = 1$

Now, put these value of x and y in given equation,

$2 \times 2 - k \times 1 = 8$

$4 - k = 8$

$k = 4 - 8$

$k = - 4$

Hence, this is the answer.

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