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 - 1.2 - Solving Multi-Step Equations - Monitoring Progress - Page 13: 8

Answer

$m=-5$

Work Step by Step

$$\begin{align*} -4(2m)+(-4)(5)-3m&=35 &\text{Apply the Distributive Property.}\\ -8m-20-3m&=35 &\text{Simplify.}\\ -11m-20&=35 &\text{Combine like terms.}\\ -11m-20+20&=35+20 &\text{Add 20 to both sides.}\\ -11m&=55 &\text{Simplify.}\\ \frac{-11m}{-11}&=\frac{55}{-11} &\text{Divide -11 to both sides.}\\ m&=-5 &\text{Simplify.}\\ \end{align*}$$ Check the answer by substituting $-5$ to the variable $m$ in the given equation. $$\begin{align*} -4(2m+5)-3m&=35\\ -4[2(-5)+5]-3(-5)&\stackrel{?}{=}35\\ -4(-5)+15&\stackrel{?}{=}35\\ 35&\stackrel{\checkmark}{=}35 \end{align*}$$ Thus, the solution is $m=-5$.
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