\(xy-3x+2y=19\)
\(\Rightarrow x\left(y-3\right)+2y-6=19-6\)
\(\Rightarrow x\left(y-3\right)+2\left(y-3\right)=13\)
\(\Rightarrow\left(x+2\right)\left(y-3\right)=13\)
\(\Rightarrow\text{ bảng sau :}\)
x+2 | -1 | -13 | 1 | 13 |
y-3 | -13 | -1 | 13 | 1 |
x | -3 | -15 | -1 | 11 |
y | -10 | 2 | 16 | 4 |