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 - Section 1.1 Functions - 1.1 Assess Your Understanding - Page 54: 24


$\text{not a function}$

Work Step by Step

A relation is a function if each element in the first set is associated with exactly one element in the second set. This relation isn't a function as there are two ordered pairs, $(-4,4)$ and $(-4,0)$, that have the same first element but different second elements.
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