find the value of k if line represented by the equation 2x-ky=9 passes through point ( -1 , -1)

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Solution

Since 2x - ky = 9 passes though (-1, -1) , we can say that x = -1 and y = -1 should satisfy the given equation.
2(-1) – k(-1) = 9
or -2 + k = 9
or k = 11

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