Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 1 - Section 1.1 - Linear Equations in One Variable - 1.1 Exercises - Page 52: 72

Answer

x = 15

Work Step by Step

1. Given: 0.05x + 0.08 + 0.06x = 0.07x + 0.68 2. Multiply both sides by 10 to the 2nd power to turn decimals into whole numbers: 100(0.05x + 0.08 + 0.06x) = (0.07x + 0.68)100 5x + 8 + 6x = 7x + 68 3. Add and subtract: 4x = 60 4. Divide: x = 15 5. Check: 0.05*15 + 0.08 + 0.06*15 = 0.07*15 + 0.68 -69.3 = -69.3, so 15 is a correct solution of the equation.
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