Answer
See below.
Work Step by Step
The definition of a function requires that for each $x$ value there is a unique $f(x)$. Thus if the vertical line test finds two different points, it means that $f(x)$ is not unique, so it cannot be a function.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 3 - Section 3.2 - The Graph of a Function - 3.2 Assess Your Understanding - Page 223: 51
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