Verified Answer :

RosaT2001

The answer would be (-6,3)

madhav10

let r=(x,y)
m=(r+s)/2
(1,3)=([x+8]/2 , [y+3]/2)

a)    1 = (x+8)/2
        2 =x+8
        x = -6
b)    3 = (y+3)/2
         6 = y+3
         y = 3

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