Answer
y=-17
Work Step by Step
Add 4 to both sides to isolate the variable.
-21=y-4
-21+4=y
-17=y
y=-17
Check the answer.
-21=(-17)-4
-21=-21
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 2 - Section 2.1 - The Addition Property of Equality - Exercise Set - Page 120: 18
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