\[y = 2x - 100;\ \ \ y = - 5x + 600\]
\[2x - 100 = - 5x + 600\]
\[2x + 5x = 600 + 100\]
\[7x = 700\]
\[x = 100.\]
\[y = 2 \bullet 100 - 100 =\]
\[= 200 - 100 = 100.\]
\[Ответ:(100;100).\]