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19 August, 16:05

Suppose y varies directly as x. if y = 3 when x = 15, find when y = 5.

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  1. 19 August, 19:38
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    X = - 9

    Step-by-step explanation:

    y = k X for some fixed number constant k.

    -5 = k (15)

    k = - 5/15 = - 1/3

    So y = (-1/3) X

    When y = 3 - --> 3 = (-1/3) X

    X = - 9
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