# Chapter 3 - Section 3.1 - Functions - 3.1 Assess Your Understanding: 34

The equation $y=|x|$ defines a function.

#### Work Step by Step

For any input x, the absolute value operation yields only one output y. For example, if $x=7$, then $y=|7|=7$. If $x=-3$, then $y=|-3|=3$. This means that the equation $y=|x|$ defines a function.

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