Graph Each Linear System, Either by Hand or Using a Graphing

Graph each linear system, either by hand or using a graphing device. Use the graph to determine whether the system has one solution, no solution, or infinitely many solutions. If there is exactly one solution, use the graph to find it. $$\left\{ \begin{array} { l } x - y = 7 \\x + 2 y = 1\end{array} \right.$$

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