Question 60983
The X value of the midpoint is the average of the two X values. 
That is {{{((2+(-3))/2)}}} which is {{{-(1/2)}}}

The Y value of the midpoint is the average of the two Y values.
That is{{{(-9+3)/2}}} which is {{{-6/2}}} which is {{{-3}}}

So, the midpoint is (-1/2, -3)