Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Section P.8 - Modeling with Equations - Exercise Set - Page 125: 73


The value of $x$ is $-3$.

Work Step by Step

Add $4$ to both sides of the provided equation to get $\begin{align} & -2x-4+4=x+5+4 \\ & -2x=x+9 \\ \end{align}$ Subtract $x$ from both sides of the above equation $\begin{align} & -2x-x=x+9-x \\ & -3x=9 \\ \end{align}$ Divide both sides of the above equation by $-3$: $\begin{align} & \frac{-3x}{-3}=\frac{9}{-3} \\ & x=-3 \end{align}$ Therefore, the value of is $-3$.
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