Ответ: [tex](1;7)[/tex]
Объяснение:
[tex]\left \{ {{2x=2|:2} \atop {x+y=8}} \right. => \left \{ {{x=1} \atop {x+y=8}} \right. => \left \{ {{x=1} \atop {(1)+y=8}} \right. =>\left \{ {{x=1} \atop {y-7=0}} \right. => \left \{ {{x=1} \atop {y=7}} \right.[/tex]
[tex]x=1\\y=7[/tex]