\[y = \left\{ \begin{matrix}2x + 4;\ \ - 2 \leq x \leq - 1 \\2;\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ - 1 < x \leq 2 \\2x - 2;\ \ \ \ \ \ \ \ \ 2 < x \leq 3 \\\end{matrix} \right.\ \]