## Elementary Algebra

Published by Cengage Learning

# Chapter 8 - Coordinate Geometry and Linear Systems - 8.3 - Slope of a Line - Concept Quiz 8.3: 4

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#### Work Step by Step

Slope is defined as the equation $\frac{\text{change in}\:y}{\text{change in}\:x}$. If a line is vertical, that means that it's $x$ value is constant, and has no change. When we go to calculate slope, we have a $0$ in the denominator, which makes the slope undefined.

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