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9 October, 15:51

Y varies directly as x. If y = - 5 when X = 15, find x when y = 3

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  1. 9 October, 16:56
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    Y varies directly as x,

    then y = kx

    when y = - 5, x = 15

    so,

    -5 = k*15

    k = - 5/15 = - 1/3

    so, y = - x/3

    when y = 3,

    3 = - x/3

    x = - 3*3

    x = - 9.
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