r varies directly as s. Find r when s = 3 and k = 5

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r varies directly as s. Find r when s = 3 and k = 5

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"r varies directly as s" means that r=as, where a is some factor (a proportionality coefficient). If your "k" is my "a" (which it probably is), then r=ks. You should be able to figure it out from here.