Algebra and Trigonometry 10th Edition

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 295: 38



Work Step by Step

As $x$ increases, $y$ decreases: $y=\frac{k}{x}$ Now, choose any point. Let's use $(15,8)$: $8=\frac{k}{15}$ $k=15\times8=120$ The variation model: $y=\frac{120}{x}$
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