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 - Lesson Check - Page 91: 4



Work Step by Step

We need to get the x alone. Thus, we cancel out the subtraction by adding 4 on both sides. This leaves us with the equation $ -x=13$. In order to cancel out multiplication, we use division, so we divide both sides by -1 to get that $x=-13$. We plug -13 in for x and confirm that our answer is, indeed, correct.
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