Решите систему:x-y=2x^2-xy+y^2=7

X=2+y,        x-y=2,                   x-y=2,          x-y=2,    x=y+2, x=y+2,    x=y+2,       x=y+2,
x-xy+y=7,  (x-2xy+y)+xy=7,  (x-y)+xy=7, 4+xy=7, xy=3,   (y+2)y=3, y+2y-3=0, [y=-3, 
                                                                                                                          y=1,
[ y=-3,
   x=-1,
  y=1,
   x=3.  
   Ответ: (-1;-3);(3;1)