Question

Rezolvati in Z X Z ecuatia xy-2x-3y=5 . E URGENT VA ROG.

Answer 1

xy-2x-3y=5 <=> x(y-2)-3(y-2)-6=5 <=> (x-3)(y-2)=11 => x-3 apartine {-11,-1,1,11}, adica x apartine {-8,2,4,14}.

x=-8 => y-2=-1, adica y=1.
x=2 => y-2=-11, adica y=-9.
x=4 => y-2=11, adica y=3.
x=14 => y-2=1, adica y=3.