Let [tex] \[f(x) = \left\{
\begin{array}{cl} ax+3, &\text{ if }x\ \textgreater \ 2, \\
x-5 &\text{ if } -2 \le x \le 2, \\
2x-b &\text{ if } x \ \textless \ -2.
\end{array}
\right.\] [/tex]
Find a+b if the piecewise function is continuous (which means that its graph can be drawn without lifting your pencil from the paper).