Answer
First
Work Step by Step
The first entry into the matrix will not have a zero in it. Thus, when it says that we are in the leftmost (first) column, it is the first row (which corresponds to the first entry) that will have no zero in it.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 8 - Systems of Linear Equations and Problem Solving - 8.6 Elimination Using Matrices - 8.6 Exercise Set - Page 551: 6
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