06-03-2019
Mathematics

contestada

If y is directly proportional to x and y = 17.5 when x=21 find y when x=39

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watermelvn watermelvn

06-03-2019

direct proportion y=kx , k is constant and k does not equal to 0.

17.5=k(21)

k=5/6

when x =39

y=5/6 ×39

y=32.5

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