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15 October, 05:29

find an equation of variation where y varies directly as x one pair of values is y equals 80 when x equals 40

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  1. 15 October, 06:35
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    y ∞ 2x, y = 2x

    y varies directly as x

    y ∞ x

    y equals 80 when x equals 40

    y = kx

    where k is a constant, when multiplied by x, gives you k.

    80 = 40k

    Solve to find k:

    80/40 = k

    80/40 = 2

    k = 2

    y = 2x
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