Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 11 - Quadratic Functions and Equations - 11.4 Applications Involving Quadratic Equations - 11.4 Exercise Set - Page 725: 54

Answer

$\left( \frac{11}{5},\frac{2}{5} \right)$

Work Step by Step

$2x-y=4$ …… (1) $x+2y=3$ …… (2) Multiply equation $\left( 2 \right)$ by $-2$, $\begin{align} & x+2y=3 \\ & x\cdot \left( -2 \right)+2y\cdot \left( -2 \right)=3\cdot \left( -2 \right) \\ & -2x-4y=-6 \end{align}$ …… (3) Add equation $\left( 1 \right)$ to equation $\left( 3 \right)$, $\begin{matrix} \underline{\begin{align} & \,\,\,\,2x-y=4 \\ & -\,2x-4y=-6 \\ \end{align}} \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,-5y=-2 \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,y=\frac{2}{5} \\ \end{matrix}$ Put the value $y=\frac{2}{5}$ in the equation $\left( 2 \right)$. $\begin{align} & x+2y=3 \\ & x+2\left( \frac{2}{5} \right)=3 \\ & x=\frac{11}{5} \end{align}$ Thus, $\left( x,y \right)=\left( \frac{11}{5},\frac{2}{5} \right)$.
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