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14 March, 19:57

Suppose y varies inversely with x. Write an equation if y=7 when x=-4

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  1. 14 March, 20:21
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    y = - 28 : x

    Step-by-step explanation:

    The standard format of a inversely proportional equation goes by the format of y = k : x. The question asks us to write an equation if y = 7 when x = - 4 and y varies inversely with x.

    So we substitute the values y = 7 and x = - 4 in the equation y = k : x

    K = constant, we have to work this out

    7 = k : - 4

    7 * - 4 = k

    k = - 4 * 7

    k = - 28

    k = - 28 So then we put this back into the original y = k : x to find our final equation which is y = - 28 : x
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