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: 4

Answer

(3,0)

Work Step by Step

Add the 2 equations. $\ \ 3x-y=9$ $\underline{\ \ 2x+y=6}$ $\ \ 5x\ \ \ \ \ \ \ =15$ divide both sides by 5 $\ \ x\ \ \ \ \ \ \ \ \ =3$ Substitute and solve for y. $2x+y=6$ $2(3)+y=6$ $6+y-6=6-6$ $y=0$
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