2 (x - y) = 0
2 (y - x) = 0
(-x + y)^2 = 0
y
x1 = 2.0 y1 = 2.0
x2 = 10.0 y2 = 10.0
x3 = 6.0 y3 = 6.0
x4 = -2.0 y4 = -2.0
x5 = -10.0 y5 = -10.0
x6 = -6.0 y6 = -6.0