\[C(x;y):\]
\[x = \frac{- 4 + 3}{2} = - \frac{1}{2} = - 0,5;\]
\[y = \frac{9 + 1}{2} = \frac{10}{2} = 5.\]
\[C( - 0,5;5).\]
\[Ответ:C( - 0,5;\ 5).\]