# Chapter 3 - 3.5 - Mathematical Modeling and Variation - 3.5 Exercises - Page 295: 38

$y=\frac{120}{x}$

#### 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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