Odpowiedź:
[tex]\left \{ {{x+y=6} \atop {y-x=5}} \right.\\ \\ {{2y=11}[/tex]
[tex]\left \{ {{y=5,5} \atop {x=6-y}}[/tex]
[tex]\left \{ {{y=5,5} \atop {x=0,5}} \right[/tex]
