find y when x=9 if y varies directly as x, and y=245 when x=7

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find y when x=9 if y varies directly as x, and y=245 when x=7

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Since y varies directly as x, you know that y=245 and x=7 can be used as a proportion, 245/7. When you multiply this proportion to 9, you get 315. This is the value of y when x=9.

y=315

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