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15 January, 09:19

Y is inversely proportional to x. When y=25, x=4 Work out y when x=20

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  1. 15 January, 10:22
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    y=5 when x=20

    Step-by-step explanation:

    Using the format for inverse proportions: y=k/x

    To find k, substitute 25 in for y and 4 for x to find:

    25=k/4 ⇒ k=100

    Using this we can substitute k and x in for 100 and 20 to find:

    y=100/20 ⇒ y=5
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