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: 21

Answer

x = 1 y = -1

Work Step by Step

4x - 3y = 7 first equation 7x + 5y = 2 second equation multiply by 5 first equation and multiply by 3 the second equation and add the equation to eleminate y 20x - 15y = 35 21x + 15y =6 ________________ 41x = 41 x = 1 divide both sides by 41 let x = 1 in first equation $4\times1$ - 3y = 7 4 - 3y = 7 -3y = 3 subtract from -4 both sides y = -1 divide both sides by -3
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