Answer
False
Work Step by Step
A function is a function if it is a relation that passes the vertical line test. Thus, it is not necessary for the function to be governed by a formula.
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: 2
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