Question

tìm x,y ngyên biết : x.y+ 3.x - y= 6

Answer 1

x.y+3x-y=6

<=> x(y+3)-y-3=6-3

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

=>(y+3)(x-1)=3=1.3=-1.-3

*) x-1=1;y+3=3=>x=2;y=0

*)x-1=3;y+3=1=>x=4;y=-2

*)x-1=-1;y+3=-3=> x=0;y=0

*)x-1=-3;y+3=-1=>x=-2;y=-2

Answer 2

x.y+3x-y=6

<=> x(y+3)-y-3=6-3

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

=>(y+3)(x-1)=3=1.3=-1.-3

*) x-1=1;y+3=3=>x=2;y=0

*)x-1=3;y+3=1=>x=4;y=-2

*)x-1=-1;y+3=-3=> x=0;y=0

*)x-1=-3;y+3=-1=>x=-2;y=-2