Answer
$(a)$
Work Step by Step
A function written in the form $y=f(x)$ is defined explicitly.
Thus, the answer is $(a)$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 2 - Functions and Their Graphs - 2.1 Functions - 2.1 Assess Your Understanding - Page 56: 18
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