Salut!
Voi nota cele doua numere cu x si y.
[tex]\left \{ {{x+y=33} \atop {x-y=15}} \right. = \left \{ {{x+y=33} \atop {x=15+y}} \right. = \left \{ {{15+y+y=33} \atop {x=15+y}} \right. = \left \{ {{2y=18} \atop {x=15+y}} \right. = \left \{ {{y=9} \atop {x=15+y}} \right. = \left \{ {{y=9} \atop {x=24}} \right.[/tex]
⇒ S = {(24; 9)}
-Luke48
