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11 October, 09:46

Suppose x and y vary inversely and y=10 when x=4. write a function that models the variation then find y when x = 90

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  1. 11 October, 10:45
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    X = k/y

    4 = k/10

    k = 4 x 10 = 40

    Thus, x = 40 / y

    90 = 40 / y

    y = 40/90 = 4/9
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