\[y = \frac{1}{3}x^{2};\ \ \ y = 6x - 15.\]
\[\frac{1}{3}x^{2} = 6x - 15\ \ \ \ \ | \cdot 3\]
\[x^{2} - 18x + 45 = 0\]
\[D = 81 - 45 = 36\]
\[x_{1} = 9 + 6 = 15;\ \ \ \ x_{2} = 9 - 6 = 3.\]
\[y_{1} = 6 \cdot 15 - 15 = 75;\ \ \ \]
\[\ y_{2} = 6 \cdot 3 - 15 = 3.\]
\[Ответ:графики\ пересекаются\ в\ \]
\[\ \ \ \ \ \ \ \ \ \ \ \ \ \ точках\ (15;75);(3;3).\]