Ответ:

(-1;3)

Объяснение:

[tex]\left \{ {{x+y=2} \atop {3x-y=-6}} \right.[/tex]

[tex]\left \{ {{y=2-x} \atop {3x - y = -6}} \right.[/tex]

[tex]\left \{ {{y=2-x} \atop {3x-(2-x)=-6}} \right.[/tex]

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

[tex]\left \{ {{y=2-(-1)} \atop {x=-1}} \right.[/tex]

[tex]\left \{ {{y=3} \atop {x=-1}} \right.[/tex]