Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 9 - Section 9.2 - Solving Pairs of Linear Equations by Addition - Exercises: 6

Answer

(-3,0)

Work Step by Step

Add the 2 equations. $\ \ -4x+2y=12$ $\underline{\ \ -3x-2y=\ \ 9}$ $\ \ -7x\ \ \ \ \ \ \ \ \ =21$ divide both sides by -7 $\ \ \ \ \ \ \ \ \ x\ \ \ \ \ \ \ \ \ =-3$ Substitute and solve for y. $-4x+2y=12$ $-4(-3)+2y=12$ $12+2y=12$ $12+2y-12=12-12$ $2y=0$ $y=0$
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