Answer
See below.
Work Step by Step
If the determinant is $0$, then the row-echelon form will contain a row full of zeros, thus the system cannot have a unique solution.
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 6 - Matrices and Determinants - Exercise Set 6.5 - Page 653: 60
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