Answer
$z=2xy$
Work Step by Step
$z=kxy$
$z=64$ when $x=4$ and $y=8$:
$64=k(4)(8)=32k$
$k=\frac{64}{32}=2$
Then:
$z=2xy$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 3 - 3.5 - Mathematical Modeling and Variation - 3.5 Exercises - Page 296: 57
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