Answer
See graph, not a function.
Work Step by Step
Step 1. See graph.
Step 2. The relation is not a function because for $x=1$ there are two $y$ values.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 2 - Linear and Quadratic Functions - Section 2.2 Building Linear Models from Data - 2.2 Assess Your Understanding - Page 133: 1
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