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OpenStudy (anonymous):
Suppose y is directly proportional to x and that y=21 when x=7. (a) Find the constant of proportionality k (b) Use y=kx to find y when x=10
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OpenStudy (anonymous):
Well, you already have the formula y=kx, so you just substitute in the values of x and y to find k, and b) with k and x, you can find y
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