{2х+у=7
{Х-ху=-4
{x-xy=-4;
{y=7-2x,
{x-x(7-2x)=-4;
{y=7-2x,
{2x^(2)-6x+4=0;
{y=7-2x,
{x^(2)-3x+2=0;
{y=7-2x, или {y=7-2x,
{x=1;..................{x=2;
{y=5,...................{y=3,
{x=1;...................{x=2.
Ответ: (1;5), (2;3).