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Coordinates of the midpoint of AC = Coordinates of the midpoint of BD. A(-3,2), B(1,5), C(2,-4) and D(x,y) ((-3+2)/2,(2-4)/2) = ((1+x)/2,(5+y)/2) (-1/2,-2/2) = ((x+1)/2,(y+5)/2) (-1/2,-1) = ((x+1)/2,(y+5)/2) (x+1)/2 = -1/2, (y+5)/2 = -1 Therefore x = -2 and y =-7