Question

Aflati nr. nat.x si y care verifica egalitatea xy-7x=11

Answer 1

xy-7x =11

x(y-7) =11   x;y   -nr naturale

1) x=1  => y-7= 11  <=> y=11+7=18

2)x=11  =>y-7=1   <=> y= 1+7=8

S(x;y)= {(1;18);(11;8)}