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If y varies directly with x, and y = 18 when x = 4, what is the constant of proportionality?
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If y varies directly with x, and y = 18 when x = 4, what is the constant of proportionality?

User Etienne Lawlor
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1 Answer

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y is directly proportional to x and therefore takes the form y=kx where k is the constant of proportionality.

Dividing both sides by x for the given values, k becomes 18/4 = 4.5
User Brooksbp
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