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 - Study Summary - Practice Exercises - Page 495: 13


$y=0.1\cdot xz$

Work Step by Step

If $y$ varies jointly as $x$ and $z,$ then $y=kxz.$ Given $x=5, z=4, y=2$, we find k $2=k\cdot 5\cdot 4$ $ 2=20k\qquad$... divide with $20$ $k=\displaystyle \frac{2}{20}=0.1$ $y=0.1\cdot xz$
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