College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Section 1.10 - Modeling Variation - 1.10 Exercises: 24

Answer

$S=9pq$

Work Step by Step

Since $S$ is jointly proportional to $p$ and $q$, we have: $S=kpq$ We are given: $S=180$ and $p=4$ and $q=5$, so we have: $180=k*4*5$ $180=20*k$ $k=180/20=9$ So the equation is: $S=9pq$
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