Answer
Your friend is incorrect.
Work Step by Step
The friend is incorrect because a vertical line pairs one input with infinitely many outputs so it can not represent a function.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 3 - Graphing Linear Functions - 3.1 - Functions - Exercises - Page 110: 29
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