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15 July, 10:10

the variables x and y vary directly when x=10 and y=25. Write and equation that relates x and y. then find y when x=8

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  1. 15 July, 10:25
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    The general governing equation here is y = k*x.

    Find the constant of proportionality, k, by subbing 10 and 25 for x and y, respectively: 25 = k (10). Then k = 25/10, or 5/2.

    The governing equation is now y = (5/2) x.

    Evaluate this for x = 8: y = (5/2) (8) = 20 (answer)
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