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

User YAMAMOTO Yusuke
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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
User Adam Fish
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