Introductory Algebra for College Students (7th Edition)

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

Chapter 2 - Section 2.5 - An Introduction to Problem Solving - Exercise Set - Page 165: 2


The number is 64.

Work Step by Step

Let $x$ = the unknown number Then "the sum of a number and 43" means $x+43$. Thus, the equation that represents the situation is: $x+43=107$ Subtract 43 on both sides of the equation to obtain: $x= 107-43 \\x=64$
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