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7 October, 05:22

If y varies directly as x, and y = 15 as x = - 3, find y for the x-value of 4.

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  1. 7 October, 06:52
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    Y = kx

    15 = - 3k

    k = - 5

    so if x = 4

    y = kx

    y = (-5) (4) = - 20

    answer

    y = - 20 when the x = 4.
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