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, x²-xy+y²=7,  (x²-2xy+y²)+xy=7,  (x-y)²+xy=7, 4+xy=7, xy=3,   (y+2)y=3, y²+2y-3=0, [y=-3,                                                                                                                            y=1, [ {y=-3,    x=-1,   {y=1,    x=3.      Ответ: (-1;-3);(3;1)