Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 7 - Section 7.1 - Systems of Linear Equations in Two Variables - Exercise Set - Page 823: 106

Answer

The system of linear equation is, $\begin{align} & 2x+3y=17 \\ & 3x+5y=29 \end{align}$

Work Step by Step

More than one solution is possible. Consider the following system: $\begin{align} & 2x+3y=17 \\ & 3x+5y=29 \end{align}$ Check to see if $\left( -2,7 \right)$ is a solution by substituting $-2$ for x and 7 for y in both of the equations. $\begin{align} & 2\left( -2 \right)+3\left( 7 \right)=17 \\ & -4+21=17 \\ & 17=17 \end{align}$ This implies that $\left( -2,7 \right)$ satisfies the first equation. $\begin{align} & 3\left( -2 \right)+5\left( 7 \right)=29 \\ & -6+35=29 \\ & 29=29 \end{align}$ This implies that $\left( -2,7 \right)$ satisfies the second equation. This concludes that the system formed has a solution as $\left( -2,7 \right)$. Thus, many solutions are possible and one of them is written in the explanation.
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