deter.x si y daca xy cu bara+yx cu bara =33

Răspuns :

10x+y+10y+x=33
11 (x+y)=33
x+y=3
(x,y) €{(1,2); (2,1)}
10x+y+10y+x=33
11x+11y=33
11(x+y)=33
x+y=33:11
x+y=3
x=1;y=2
x=2;y=1