x*y = 8
x + y = 8
1.17157287525381
6.82842712474619
x1 = 1.17157287525377 y1 = 6.828427124746229
x2 = 6.82842712474619 y2 = 1.17157287525381
x3 = 1.17157287525381 y3 = 6.82842712474619