Answer
Yes, it is, see logic below...
Work Step by Step
As we did in the first exercise, we plug in the variables and we see...
$$-1+3-1=3$$
$$1+3+1=5$$
$$-1+6-3=2$$
All these are correct, thus this must be a solution.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 9 - Section 9.1 - Solving Systems of Linear Equations in Three Variables and Problem Solving - Vocabulary and Readiness Check - Page 637: 3
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