{2х+у=7
{Х–ху=–4
{x–xy=–4;
{y=7–2x,
{x–x(7–2x)=–4;
{y=7–2x,
{2x2–6x+4=0;
{y=7–2x,
{x2–3x+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).