\[y = \left\{ \begin{matrix} x^{2},\ \ \ \ если\ x \leq 0 \\ 8,\ \ \ \ \ \ \ если\ x > 0 \\ \end{matrix} \right.\ \]
\[x = - 4:\]
\[y = ( - 4)^{2} = 16.\]
\[x = 0:\]
\[\ y = 0^{2} = 0.\]
\[x = 6:\]
\[y = 8.\]