\[y = \frac{1}{2}x^{2};\ \ y = 12 - x.\]
\[\frac{1}{2}x^{2} = 12 - x\ \ \ \ \ \ \ \ \ | \cdot 2\]
\[x^{2} + 2x - 24 = 0\]
\[D = 1 + 24 = 25\]
\[x_{1} = - 1 + 5 = 4;\ \ \ x_{2} = - 1 - 5 = - 6\]
\[y_{1} = 12 - 4 = 8;\ \ \ \ y_{2} = 12 + 6 = 18\]
\[Ответ:графики\ пересекаются\ в\ \]
\[точках\ (4;8);( - 6;18).\]