On parallelogram ABCD below, if A(1, 1) B(8,-5), C(5,-5) and D(-2, -9), what are the coordinates of point E?

In the parallelogram ABCD, diagonal AC and diagonal BD intersect eact other at point E.
Determine the coordinate of point E.
[tex]\begin{gathered} E(x,y)=(\frac{1+5}{2},\frac{1-5}{2}) \\ =(\frac{6}{2},\frac{-4}{2}) \\ =(3,-2) \end{gathered}[/tex]So coordinates of point E are (3,-2).