Question

[Kalluto Zoldyck]

Tim x va y thuoc Z, biet:

xy - x + 2y = 3     ghi cach lam nua nhe!

Ai nhanh nhat; dung nhat like lun!!!!!!

Answer 1

[Nguyễn Trung Kiên]

xy-x+2y=3

=y(x+2)-x=3

=y(x+2)-x+2=5

=(y+1)(x+2)=5

TH1

y+1=5=>y=4

x+2=1=>x=-1

TH2

y+1=1=>y=0

x+2=5=>x=3

TH3

y+1=-1=>y=-2

x+2=-5=>x=-7

TH4

y+1=-5=>y=-6

x+2=-1=>x=-3

k mình nha

Answer 2

[Thắng Nguyễn]

<=>(x+2)y-x+y=3

=>(x+2)y-x-3=0

=>x+2=0

=>x=2

=>y-1=0

=>y=1