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r-ruslan [8.4K]

3 years ago

9

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

1 answer:

astra-53 [7]3 years ago

8 0

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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