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: 2

Answer

(6,2)

Work Step by Step

Add the 2 equations. $\ \ x+y=8$ $\underline{\ \ x-y=4}$ $2x\ \ \ \ \ \ \ =12$ divide both sides by 2 $\ \ x\ \ \ \ \ \ \ =6$ Substitute and solve for y. $x-y=4$ $6-y=4$ $6-y+y-4=4+y-4$ $6-4=y$ $2=y$
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