Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 1 - Solving Linear Equations - 1.5 - Rewriting Equations and Formulas - Exercises - Page 40: 21

Answer

$x=\frac{12-y}{5+4k}$, where $k\neq0$.

Work Step by Step

The given equation is $\Rightarrow 12-5x-4kx=y$ Subtract $12$ from each side. $\Rightarrow 12-5x-4kx-12=y-12$ Simplify. $\Rightarrow -5x-4kx=y-12$ Use distributive property. $\Rightarrow -x(5+4k)=y-12$ Divide each side by $-(5+4k)$. $\Rightarrow \frac{-x(5+4k)}{-(5+4k)}=\frac{y-12}{-(5+4k)}$ Simplify. $\Rightarrow x=\frac{12-y}{5+4k}$ Hence, the rewritten literal equation is $x=\frac{12-y}{5+4k}$, where $k\neq0$.
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