briannabigelow9053 briannabigelow9053

29-10-2017
Mathematics

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Suppose y varies directly as x and y=21 when x=7. which is an equation relating x and y

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tynollette tynollette

29-10-2017

y varies directly as x: y=kx, k is a constant.
when x=7, y=21, so we know k=3
therefore, the equation is y=3x

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