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

$$y=-1,\:x=2$$
Solving using the elimination method, we obtain: $$\begin{bmatrix}3x-y=7\\ x+y=1\end{bmatrix}\\ \begin{bmatrix}3x-y=7\\ 3x+3y=3\end{bmatrix}\\ \begin{bmatrix}3x-y=7\\ 4y=-4\end{bmatrix}\\ y=-1,\:x=2$$