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Mathematics 20 Online
OpenStudy (sambam):

If x and y vary directly, and x = 9 when y = 3, what will be the value of x when y = 15?

OpenStudy (whpalmer4):

If x and y vary directly, that means that y = kx or x = y/k where k is some constant. We can use y=3 when x = 9 to find k, then plug y=15 into that formula to get the corresponding value of x.

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