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4 July, 21:48

If y varies directly with x when y=1/3 and x = 12, find x if y is 4.

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  1. 5 July, 00:58
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    x = 144

    Step-by-step explanation:

    y α x

    we introduce a constant 'k' when changing from α to =.

    i. e y = kx

    y = ⅓ when x = 12

    Meaning, ⅓ = k * 12

    ⅓ = 12k

    k = ⅓ : 12

    k = 1/36

    If y = 4, x = ?

    using the equation y = kx

    4 = (1/36) x

    x = 4 : (1/36)

    x = 4 * 36

    x = 144
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