Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter 1 - Functions and Their Graphs - Chapter Review - Review Exercises - Page 113: 2

Answer

The given relation is not a function.

Work Step by Step

A function can not have two different $y$ coordinates for the same $x$ coordinate. We see that not every $x$ coordinate in the given relation is paired with only one $y$ coordinate. For instance, the x-coordinate $4$ is paired with two different $y$ coordinates, $-1$ and $2$. Therefore, the given relation is not a function.
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