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: 46

Answer

2 $\times$ ( 8 + x ) = x - 20

Work Step by Step

Problem: Twice the sum of 8 and a number is the difference of the number and 20 Let's start from the beginning. Twice the sum means we should have 2 $\times$ ( some sum ) The sum = 8 and a number Let's call the number x so the sum = 8 + x Now, we have 2 $\times$ ( 8 + x ) "is" means = the difference of the number and 20 means we should subtract 20 from x so 2 $\times$ ( 8 + x ) = x - 20
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