#### 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 $-9$.

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

3

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.