Precalculus Examples

, ,
When three variable quantities have a constant ratio, their relationship is called a direct variation. It is said that one variable varies directly as the other two vary. The formula for direct variation is , where is the constant of variation.
Solve the equation for , the constant of variation.
Replace the variables , , and with the actual values.
Reduce the expression by cancelling the common factors.
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Cancel the common factor.
Rewrite the expression.
Raise to the power of .
Write the equation of variation such that , replacing with the .
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