## College Algebra 7th Edition

Published by Brooks Cole

# Chapter 1, Equations and Graphs - Chapter 1 Review - Exercises: 111

#### Answer

$M=8z$

#### 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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