Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 4 - Section 4.1 - Solving Systems of Linear Equations by Graphing - Exercise Set - Page 291: 36

Answer

$(3,5)$

Work Step by Step

Please see the screenshot of the tables for the two equations. Purple line: $2x-3y=-9$ Green line: $4x-y=7$ If we substitute the $x$ and $y$ for $3$ and $5$ respectively, for the purple line: $2x-3y=-9$ $2(3)-3(5)=-9$ $6-15=-9$ (true) Green line: $4x-y=7$ $4(3)-5=7$ $12-5=7$ (true) Purple line: $2x-3y=-9$ $2x-3y+3y+9=-9+3y+9$ $2x+9=3y$ $(2x+9)/3=3y/3$ $y=2/3*x+3$ ($m=2/3$, y-intercept is 3) Green line: $4x-y=7$ $4x-y+y-7=7+y-7$ $4x-7=y$ ($m=4$, y-intercept is -7)
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