Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 7 - Functions and Graphs - 7.5 Formulas, Applications, and Variation - 7.5 Exercise Set: 6

Answer

$c$

Work Step by Step

RECALL: When $y$ varies jointly as $x$ and $z$ the variation is represented by the equation $y=kxz$ where $k$ is the constant of variation (constant ratio). Thus, the given equation represents joint variation where $y$ varies directly as $x$ and $z$. Therefore, the answer is $c$.
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