Answer:
The answer is (4+x1)/2=-1 and -15+y1=16 (a and c)
Explanation:
-2 = 4+x2
16 = -15 + y2
xm, ym = (x1+x2)/2 , (y1+y2)/2
xm = (x1+x2)/2
ym = (y1+y2)/2
substitute in what we know
-1 = (4+x2)/2
8 = (-15+y2)/2
multiply each equation by 2
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