Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 6 - Algebra: Equations and Inequalities - 6.2 Linear Equations in One Variable and Proportions - Exercise Set 6.2: 28

Answer

{-19}

Work Step by Step

13x + 14 = -5 + 12x Step 1 : Collect variable terms on one side and constants on the other side. subtract 12x from both the sides 13x + 14 - 12x = -5 +12x -12x Simplify x + 14 = -5 Subtract -14 from both the sides x + 14 -14 = -5 -14 Simplify x = -19 Now we check the proposed solution,-19 , by replacing x with -19 in the original equation. Step 1: the original equation 13x + 14 = -5 + 12x Step2: Substitute -19 for x 13(-19) + 14 = -5 + 12(-19) Step 3: Multiply 13(-19) = 13 .-19 = -247, 12(-19) = 12. -19 = -228 -247 + 14= -228 - 5 Step 4: Solve -233 = -233 Since the check results in true statement, we conclude that the solution set of the given equation is {-19}
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