Question 493710
the midpoint x value is the average of the two given x values and the midpoint y value is the average of the two given y values.  
So, 
midpoint of (1,-7) and (-5,-3) is ({{{(1+(-5))/2}}},{{{(-7+(-3))/2}}})
=
({{{-2}}},{{{-5)}}})
always check to make sure that the point looks like it is about in the middle