Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 9 - Systems and Matrices - 9.2 Matrix Solution of Linear Systems - 9.2 Exercises: 6

Answer

3

Work Step by Step

To turn the element $-9$ (row 2, column 1) into 0, we would multiply the (3) in the row above it with $3$, and then add it to the $-9$.
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