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Suppose y varies directly as x and y=21 when x 3 find x when y=42
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Suppose y varies directly as x and y=21 when x 3 find x when y=42

User Elynn
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35
y=kx, where k is a constant
substitute in y=21 and x=3, you will get k=7
y=7(5)
y= 35
User Lubilis
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