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.
$x-y=4$
$6-y=4$
$6-y+y-4=4+y-4$
$6-4=y$
$2=y$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
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 - Page 332: 2
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