Answer
This is a function.
Work Step by Step
For every input (x-value) there is exactly one output (y-value). The fact that all of the y-values are the same is insignificant; that just means that this is a horizontal line.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 4 - An Introduction to Functions - 4-6 Formalizing Relations and Functions - Practice and Problem-Solving Exercises - Page 272: 25
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