Will medal and fan. If x varies directly as y, and x=42 when y=7, find x when y=3

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Will medal and fan. If x varies directly as y, and x=42 when y=7, find x when y=3

Mathematics
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all i need is the set up
equation for direct variation \[\huge\rm y=kx\] where k is constant of variation.
substitute x and y for their values solve for k

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Other answers:

Ok so you are going to do this: 42/7 = x/3 Now cross multiply 42*3 = 7x Solve for x
okay that makes sense. thank you
126 = 7x x = 18 Medal? Please

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