Algebra 2 (1st Edition)

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

Chapter 2 Linear Equations and Functions - Mixed Review - Lessons 2.1-2.4 - Page 106: 3


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The vertical line test can be used to tell if a relation is a function or not, for if a relation is not a function, a vertical line can pass through the graph of the relation multiple times. This would mean that there are multiple outputs for one input, making it not a function.
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