Answer
$y$ is a function of $x$.
Work Step by Step
$x+y=25$
$y=25-x$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 2 - Functions and Graphs - Exercise Set 2.1 - Page 224: 12
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