Arturo O. answered 09/08/16
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xm = (x1 + x2) / 2 = [8+(-1)]/2 = 7/2
ym = (y1 + y2) / 2 = [-10+(-6)]/2 = -16/2 = -8
The mid point coordinates are (7/2, -8) [easier to visualize as (3.5, -8)]