Решите систему уравнений {(x-1) (y+10)=9
{х-у=11

{(x-1)(y+10)=9. {x=11+y{x-y=11. =>. { (11+y-1)(y+10)=9 (y+10)(y+10)=9 (y+10)^2=9 y+10=-/~9~ y+10=3. y+10=-3 y=-7. y=7 X=11+y. X=11+(-7)=4. X=11+7=18 Ответ: (4;-7); (18;7)