Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 5 - Linear Functions - 5-6 Parallel and Perpendicular Lines - Practice and Problem-Solving Exercises - Page 334: 28

Answer

Always

Work Step by Step

Horizontal lines have a slope of 0. The x-axis is a horizontal line, so it also has a slope of 0. Lines are parallel when the two slopes are the same. Because the slope of both the x-axis and all other horizontal lines is 0, we know that the x-axis will always be parallel to a horizontal line.
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