Answer
$y=-\frac{7}{10}x$
Work Step by Step
As $x$ increases, $y$ increases too:
$y=kx$
Now, choose any point. Let's use $(10,-7)$:
$-7=k(10)$
$k=-\frac{7}{10}$
The variation model:
$y=-\frac{7}{10}x$
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 295: 37
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