Answer
4
Work Step by Step
Given that we know x=1 is part of the solution set,
we back-substitute it into one of the initial equations:
$x+y=5$
$1+y=5\quad/-1$
$y=4$
Confirm by substituting into the first equation:
$-2(1)+5(4)=18$
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: 1
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