Answer
The answer is below.
Work Step by Step
We use the substitution method when it is easy to isolate one of the variables in one of the equations. If this is not the case, then we use the elimination-by-addition method.
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
Published by
Cengage Learning
ISBN 10:
1285194055
ISBN 13:
978-1-28519-405-9
Chapter 8 - Coordinate Geometry and Linear Systems - 8.6 - Elimination-by-Addition Method - Problem Set 8.6 - Page 379: 56
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