# Chapter 3 - Section 3.4 - The Slope of a Line - Exercise Set: 21

Horizontal

#### Work Step by Step

We are given that $m=0$, which means that the slope of the line is zero (as shown on the box on pg. 158). In other words, as we move from left to right on the line, the y-value stays the same. So the line is horizontal from left to right.

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