Odpowiedź :
[tex]\left \{ {{-x+y=-1} \atop {2x-y=2}} \right. \\\left \{ {y=x-1} \atop {2x-x+1=2}} \right. \\\left \{ {{y=x-1} \atop {x=1}} \right. \\\left \{ {{x=1} \atop {y=0}} \right.[/tex]
[tex]\left \{ {{-x+y=-1} \atop {2x-y=2}} \right. \\\left \{ {y=x-1} \atop {2x-x+1=2}} \right. \\\left \{ {{y=x-1} \atop {x=1}} \right. \\\left \{ {{x=1} \atop {y=0}} \right.[/tex]