Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 8 - Coordinate Geometry and Linear Systems - 8.3 - Slope of a Line - Concept Quiz 8.3: 6



Work Step by Step

Horizontal lines have a slope of $0$. Slope is defined as the $\frac{\text{change in}\:y}{\text{change in}\:x}$. If a line is horizontal, that means that it's $y$ value is constant. When we go to calculate slope, we have a $0$ in the numerator, which makes the slope $0$. Therefore, any line which is horizontal will have a slope of $0$.
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