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 818: 20


The required value is $x=2,\,y=4$

Work Step by Step

By adding both equations, we obtain: $\begin{align} & x+y+\left( x-y \right)=6-2 \\ & 2x=4 \\ & x=2 \end{align}$ Substitute the value of $x=2$ in the second equation and obtain, $\begin{align} & 2-y=-2 \\ & -y=-2-2 \\ & -y=-4 \\ & y=4 \end{align}$ Thus, the value of $x=2$ and $y=4$.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.