Introductory Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-805-X
ISBN 13: 978-0-13417-805-9

Chapter 1 - Section 1.5 - Addition of Real Numbers - Exercise Set - Page 64: 83

Answer

Start at $0$ then move $a$ units to the right, then move $a$ units to the left. The ending position is the sum of $a+(-a)$.

Work Step by Step

Starting at $0,$ go to the right by $a$ units. To add $-a,$ start at $a$ then go to the left by $a$ units. The ending point (which is at $0$) is the sum of $a+(-a).$
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