Answer
Yes
Work Step by Step
Consider the equation of a circle. $y$ and $x$ are related to each other, yet it is not a function as the relation fails the vertical line test.
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 1 - Linear Functions and Change - Strengthen Your Understanding - Page 60: 5
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