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31 October, 19:16

If y varies inversely with x and y = 5 when x=20 find x when y = - 4

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  1. 31 October, 19:30
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    x=-25

    Step-by-step explanation:

    Inverse variation

    xy = k

    We know x and y

    20*5 = k

    100 = k

    So the formula is

    x y = 100

    We know y = - 4

    x (-4) = 100

    Divide each side by - 4

    -4x/-4 = 100/-4

    x = - 25
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