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14 April, 08:33

Find the value of k so that x = - 1 and y = -1 is a solution of the linear equation 9kx + 12ky = 63

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  1. 14 April, 10:13
    0
    k = - 3

    Step-by-step explanation:

    Given

    9kx + 12ky = 63

    Since x = - 1 and y = - 1 are solutions of the equation

    Substitute x = - 1 and y = - 1 into the equation and solve for k

    9k ( - 1) + 12k ( - 1) = 63, that is

    - 9k - 12k = 63

    - 21k = 63 (divide both sides by - 21)

    k = - 3
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