Answer
$$ y=-x+21$$
Work Step by Step
Simplifying the equation until it is in the form $y=mx+b$, we find:
$$x+y =21 \\ y=-x+21$$
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 - 1.4 Formulas for Linear Functions - Exercises and Problems for Section 1.4 - Exercises and Problems - Page 34: 24
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