Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 2 Linear Equations and Functions - 2.1 Represent Relations and Functions - 2.1 Exercises - Skill Practice - Page 77: 24


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Work Step by Step

A relation is a function if every input has exactly one output. Note, multiple inputs can have the same output, but no input can have multiple outputs. If a vertical line passed through the relation twice, that would mean that one input had more than one output, making the relation not a function.
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