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18-05-2017
Mathematics

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Suppose y varies directly with x. Write an equation relating x and y. y = 7.5 when x = 10

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18-05-2017

y = kx is the direct variation equation.
First you have to find k.
7.5 = k(10)
divide both sides by 10
7.5/10 = k
.75 = k
y = .75x is the equation relating x and y with these criteria.

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