Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 2 - Solving Equations - 2-2 Solving Two-Step Equations - Practice and Problem-Solving Exercises - Page 91: 20



Work Step by Step

We need to get the a alone. Thus, we cancel out the subtraction by adding 18 on both sides. This leaves us with the equation a/5=20. In order to cancel out division, we use multiplication, so we multiply both sides by 5 to get that a=100. We plug 100 in for a and confirm that our answer is, indeed, correct.
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