Question 319552
Given two points, the midpoint is:
( (x1+x2)/2  , (y1+y2)/2 )
.
So, given your two points:
(3,-5), (-5, 7)
( (3+(-5))/2  , ((-5)+7)/2 )
( (3-5)/2  , (-5+7)/2 )
( (-2)/2  , (2)/2 )
( -1  , 1 )