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 5 - Solving Systems of Linear Equations - Chapter Review - Page 284: 14

Answer

The solution is $x=-3$. The graph is shown below.

Work Step by Step

The given equation is $\Rightarrow \frac{1}{3}x+5=-2x-2$ Write a system of linear equations using each side of the original equation. $\Rightarrow y=\frac{1}{3}x+5$ ...... (1) $\Rightarrow y=-2x-2$ ...... (2) By using graphing calculator graph the system. The intersection point is $(-3,4)$. Check: $\Rightarrow \frac{1}{3}x+5=-2x-2$ $\Rightarrow \frac{1}{3}(-3)+5=-2(-3)-2$ $\Rightarrow -1+5=6-2$ $\Rightarrow 4=4$ True. Hence, the solution is $x=-3$.
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