College Algebra 7th Edition

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

Chapter 1, Equations and Graphs - Chapter 1 Review - Exercises - Page 171: 111



Work Step by Step

Since we are told that $M$ varies directly as $z$, we have: $M=kz$ We are given: $M=120$ and $z=15$, so we have: $120=k*15$ $k=8$ Thus, the equation is: $M=8z$
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