Verified answer

Ответ:

[tex]12 \ , \ 5 \ ;[/tex]

Пошаговое объяснение:

[tex]\displaystyle \left \{ {{x+y=17} \atop {x-y=7}} \right. \bigg |+ \Leftrightarrow \left \{ {{x+x+y-y=17+7} \atop {y=x-7}} \right. \Leftrightarrow \left \{ {{2x=24} \atop {y=x-7}} \right. \Leftrightarrow \left \{ {{x=12} \atop {y=5}} \right. ;[/tex]