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: 10

Answer

$y = -3, x = 2$

Work Step by Step

$x + y = -1$ $3x + 2y = 0$ $3(x+y) = -1 \times 3$ $3x + 2y = 0$ $3x + 3y = -3$ $3x + 2y = 0$ $3x - 3x + 3y -2y = -3 - 0$ $y = -3$ $3x + 2 \times -3 = 0$ =>$3x -6 = 0$ =>$3x = 6$ =>$x = 2$
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