Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 11 - Systems of Equations and Inequalities - 11.1 Systems of Linear Equations: Substitution and Elimination - 11.1 Assess Your Understanding - Page 715: 35

Answer

$\left\{\left(\dfrac{3}{2},1\right)\right\}$

Work Step by Step

We are given the system of equations: $\begin{cases} 2x+3y=6\\ x-y=\dfrac{1}{2} \end{cases}$ Use the elimination method. Multiply the second equation by $-2$ and add it to the first equation to eliminate $x$ and determine $y$: $\begin{cases} 2x+3y=6\\ -2(x-y)=-2\left(\dfrac{1}{2}\right) \end{cases}$ $\begin{cases} 2x+3y=6\\ -2x+2y=-1 \end{cases}$ $2x+3y-2x+2y=6-1$ $5y=5$ $y=1$ Determine $x$ using the second equation: $x-y=\dfrac{1}{2}$ $x-1=\dfrac{1}{2}$ $x=\dfrac{1}{2}+1$ $x=\dfrac{3}{2}$ The solution set of the system is: $\left\{\left(\dfrac{3}{2},1\right)\right\}$
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