xy-2y+3x-6=3
(xy-2y)+(3x-6)=3
y(x-2)+3(x-2)=3
(x-2)(y+3)=3=1.3=−1(−3)
TH1: (x−2)(y+3)=−1(−3)
=>x−2=−1,y+3=−3x−2=−1,y+3=−3 hoặc x−2=−3,y+3=−1
=>x=1,y=−6x=1,y=−6 hoặc x=−1,y=−4
TH2: (x−2)(y+3)=1.3
=>x−2=1,y+3=3x−2=1,y+3=3 hoặc x−2=3,y+3=1
=>x=3,y=0x=3,y=0 hoặc x=5,y=−2