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: 3

Answer

(4,2)

Work Step by Step

Add the 2 equations. $2x+5y=18$ $\underline{4x-5y=\ \ 6}$ $6x\ \ \ \ \ \ \ =24$ divide both sides by 6 $\ \ x\ \ \ \ \ \ \ =4$ Substitute and solve for y. $2x+5y=18$ $2(4)+5y=18$ $8+5y-8=18-8$ $5y=10$ $5y\div5=10\div5$ $y=2$
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