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

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 $-11.$

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