Precalculus (6th Edition)

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: 2

Answer

$-3$

Work Step by Step

Given that we know $y=0$ is part of the solution set, we back-substitute it into one of the initial equations: $6x+y=-18$ $6x+0=-18$ $6x=-18\quad/\div 6$ $x=-3$ Confirm by substituting into the second equation, $13(-3)+(0)=-39.$
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