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Mathematics 10 Online
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

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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