x*y = 2
x - y = 3
-0.561552812808830
-3.56155281280883
3.56155281280883
0.561552812808830
x1 = -0.5615528128088303 y1 = -3.56155281280883
x2 = 3.56155281280883 y2 = 0.5615528128088303