=>x(y+1)+y+1=2
=>(x+1)(y+1)=2
=>\(\left(x+1;y+1\right)\in\left\{\left(1;2\right);\left(2;1\right);\left(-1;-2\right);\left(-2;-1\right)\right\}\)
=>\(\left(x,y\right)\in\left\{\left(0;1\right);\left(1;0\right);\left(-2;-3\right);\left(-3;-2\right)\right\}\)