Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 2 - Functions, Equations, and Graphs - 2-2 Direct Variation - Practice and Problem-Solving Exercises - Page 73: 58

Answer

$x = 1$

Work Step by Step

We need to solve each equation first. Let's look at the first equation. To get rid of the absolute value sign, we use the definition of absolute value to rewrite the equation as two equations, which is $|a|=b\implies a=b \quad \text{or} \quad a=-b$: $x - 3 = -2$ or $x - 3 = 2$ Add $3$ to each side of the equation: $x = 1$ or $x = 5$ Let's look at the second equation. To get rid of the absolute value sign, we use the definition of absolute value to rewrite the equation as two equations: $9 - x = -8$ or $9 - x = 8$ Subtract $9$ from each side of the equation: $-x = -17$ or $-x = -1$ Divide both sides of the equation by $-1$: $x = 17$ or $x = 1$ We want to find the common solution, which is $x = 1$.
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