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2 May, 18:30

Find direct variation if y=-6 when x=9, find x when y=-3

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  1. 2 May, 18:46
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    direct variation

    y = kx

    substitute y and x to find k

    -6 = k (9)

    divide by 9

    -6/9 = k

    k = - 2/3

    y = - 2/3 x

    now substitute y = -3 to find x

    -3 = - 2/3 x

    multiply by - 3/2 on each side

    -3 * - 3/2 = - 3/2 * - 2/3 x

    9/2 = x
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