Algebra: A Combined Approach (4th Edition)

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

Chapter 4 - Section 4.3 - Solving Systems of Linear Equations by Addition - Exercise Set: 10

Answer

x = -2 y = 4

Work Step by Step

x + 4y = 14 first equation -5x - 20y = - 70 multiply by -5 5x + 3y = 2 second equation ________________ -17y = - 68 add the equations to eleminate x y = 4 divide both sides by -17 let y = 4 in first equation x + $4\times4$ = 14 x + 16 =14 x =14 - 16 subtract 16 from both sides x = -2
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