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 1.1 - Introduction to Algebra: Variables and Mathematical Models - Exercise Set - Page 11: 45

Answer

solution

Work Step by Step

30 - y = 10;20 To check whether 20 is the solution of the given expression, Substitute 20 for y 30 - 20 =10 (subtract 30 -20) 10 =10 The statement is true because the values on both sides of the equation are the same, the number 20 is a solution of the equation.
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