Answer
$-11.$
Work Step by Step
To eliminate y, we want the coefficients of y to
- have opposite signs and
- be equal in absolute value
We achieve this by multiplying (2) by $-11.$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 9 - Systems and Matrices - 9.1 Systems of Linear Equations - 9.1 Exercises - Page 856: 3
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