xy-2x+y=-2 giúp mik nha nhanh giúp mik ạ

`xy - 2x + y = -2`

`=> xy - 2x + y + 2=  0`

`=> x(y - 2) + (y - 2)+  4=  0`

`=> x(y - 2) + (y - 2) = - 4`

`=> (y - 2)(x + 1) = -4`

`=> -4 \vdots x + 1`

`=> x +1 \in Ư(-4)`

`=> x +1 \in {+-1,+-2,+-4}`

Ta có bảng sau:

$$\begin{array}{|c|c|c|}\hline \text{x + 1}&\text{1}&\text{-1}&\text{2}&\text{-2}&\text{4}&\text{-4}\\\hline \text{y - 2}&\text{-4}&\text{4}&\text{-2}&\text{2}&\text{-1}&\text{1}\\\hline \text{x}&\text{0}&\text{-2}&\text{1}&\text{-3}&\text{3}&\text-5{}\\\hline \text{y}&\text{-2}&\text{6}&\text{0}&\text{4}&\text{1}&\text{3}\\\hline \text{KL}&\text{tm}&\text{tm}&\text{tm}&\text{tm}&\text{tm}&\text{tm}\\\hline\end{array}$$

Vậy (x,y) `\in{(0,-2);(-2,6);(1,0);(-3,4);(3,1);(-5,3)}`