--- /dev/null
+\begin{tikzpicture}[scale=0.35,auto]
+
+\path[draw,->] (-.5,0) -- (10,0);
+\path[draw,->] (0,-5) -- (0,5);
+\path[draw,-,thick] (0,0) -- (5,5) -- (9.5,.5);
+
+\end{tikzpicture}
+
--- /dev/null
+\begin{tikzpicture}[scale=0.35,auto]
+
+\path[draw,->] (-.5,0) -- (10,0);
+\path[draw,->] (0,-5) -- (0,5);
+\path[draw,-,thick] (0,0) -- (5,-5) -- (9.5,-.5);
+
+\end{tikzpicture}
+
--- /dev/null
+\begin{tikzpicture}[scale=0.35,auto]
+
+\path[draw,->] (-.5,0) -- (10,0);
+\path[draw,->] (0,-5) -- (0,5);
+\path[draw,-,thick] (0,0) -- (2.5,2.5) -- (7.5,-2.5) -- (9.5,-.5);
+
+\end{tikzpicture}
--- /dev/null
+\begin{tikzpicture}[scale=0.35,auto]
+
+\path[draw,->] (-.5,0) -- (10,0);
+\path[draw,->] (0,-5) -- (0,5);
+\path[draw,-,thick] (0,0) -- (2.5,-2.5) -- (7.5,2.5) -- (9.5,.5);
+
+\end{tikzpicture}