Answer
y is not a function of x
Work Step by Step
The graph is represented in green.
The orange vertical line $x=4$ passes through the graph at 2 points, therefore y is not a function of x.
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter P - Review Exercises - Page 38: 46
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