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18 September, 07:55

If y=-16 when x=4 find x when y=48

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  1. 18 September, 10:30
    0
    x = - 12

    Step-by-step explanation:

    Assuming this is a direct variation

    y = kx

    When y = - 16 x = 4 we can find k

    -16 = k*4

    Divide each side by 4

    -16/4 = 4k/4

    -4 = k

    So

    y = - 4k

    Y = 48

    48 = - 4x

    Divide each side by - 4

    48/-4 = - 4x/-4

    -12 = x
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