Find the midpoint of (x,y)(x, y)(x,y) and (−x,−y)(-x, -y)(−x,−y).
(x,y)(x, y)(x,y)
(0,0)(0, 0)(0,0)
(2x,2y)(2x, 2y)(2x,2y)
(1,1)(1, 1)(1,1)