Direct Variation. If a situation is described by an equation in the formy = kxwhere k is a constant, we say that y varies directly as x. The number k is called the constant of variation. . Solving Variation Problems. Write an equation that describes the given English statement.Substitute the given pair of values into the equation in step 1 and find the value of k. Substitute the value of k into the equation in step 1. Use the equation from step 3 to answer the problem's question. .
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