Algebra 1: Common Core (15th Edition)

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

Chapter 4 - An Introduction to Functions - 4-6 Formalizing Relations and Functions - Practice and Problem-Solving Exercises - Page 273: 35


Horizontal line: Yes Vertical line: No

Work Step by Step

Just consider this question in terms of the vertical line test. A horizontal line will always pass the vertical line test as there is no vertical line that can intersect a horizontal line twice, thus making horizontal lines functions. However, for a vertical line, another vertical line can be placed on top of it. This indicates that there are multiple outputs for one input, so this is not a function.
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