Question

Aflati perechile de nr. naturale(x,y) di urmatoarele ecuatii:
a)xy+x=3
b)x-y-y=5
c)2*xy+6y-1=7
d)y*(x+2)-3*(x+2)=12

Answer 1

a)xy+x=3 => x(y+1)=3 => X=1 si y=2 b)x-y-y=5 => X-2y=5 => X=7, y=1 sau X=9, y=2, sau .... c)2*xy+6y-1=7 => 2y(X+3)-1=7 => y=1, x=1, d)y*(x+2)-3*(x+2)=12 => (X+2)*(y-3)=12 => (X+2)*(y-3)=4*3 => X=2, y=4 (X+2)*(y-3)=6*2 => X=4, y=5