\[y = 5x^{2};\ \ y = 15x;\]
\[5x^{2} = 15x\]
\[5x^{2} - 15x = 0\]
\[5x(x - 3) = 0\]
\[x_{1} = 0;\ \ \ x_{2} = 3;\]
\[y_{1} = 0;\ \ y_{2} = 45.\]
\[Ответ:(0;0);(3;15).\]