###### Itemb

On the plot below, graph the lines

\begin{equation*} \begin{aligned} y \amp = x+1 \\ y \amp = x-1\text{.} \\ \end{aligned} \end{equation*}

At what point or points $$(x,y)\text{,}$$ do the lines intersect? How many points $$(x,y)$$ satisfy both equations?

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