Answer
The graph does not represent a function.
Work Step by Step
Note that the vertical line $x=-1$ will pass through an infinite number of points.
Thus, the graph fails the vertical line test and so it does not represent a function.
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 2 - Section 2.2 - Graphs of Functions - 2.2 Exercises - Page 168: 55
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