College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 3 - Polynomial and Rational Functions - Exercise Set 3.7 - Page 430: 1

Answer

156

Work Step by Step

Solving Variation Problems (see p. 424) 1. Write an equation that models the given English statement. 2. Substitute the given pair of values into the equation in step 1 and find the value of k, the constant ofvariation. 3. Substitute the value of k into the equation in step 1. 4. Use the equation from step 3 to answer the problem's question. ----------- 1. $y$ varies directly as $x$, or $y$ is directly proportional to $x$. $y=kx$ 2. $65=k(5) \qquad /\div 5$ $k=13$ 3. $y=13x$ 4. $y=13(12)=156$
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