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)