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21 February, 22:22

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

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  1. 21 February, 23:38
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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
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