Elementary Linear Algebra 7th Edition

Published by Cengage Learning
ISBN 10: 1-13311-087-8
ISBN 13: 978-1-13311-087-3

Chapter 1 - Systems of Linear Equations - 1.1 Introduction to Systems of Linear Equations - 1.1 Exercises - Page 10: 17


$x=2$ $y=-1$ (2, -1)

Work Step by Step

$2x -y = 5$ $5x -y = 11$ Subtract the first equation from the second one. $5x-y-(2x-y)=11-5$ $5x-2x-y+y=6$ $3x=6$ $x=2$ Substitute x in the first equation to get y $2*2 -y=5$ $-y=5-4$ $y=-1$
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