Verified answer

Ответ:y=6; x=2

Объяснение:

[tex]\left \{ {{3x+y=12} \atop {-3x+5y=24}} \right.[/tex]
1.
[tex]3x+y+(-3x+5y)=12+24[/tex]
[tex]3x+y-3x+5y=36[/tex]
[tex]6y=36[/tex]
[tex]y=6[/tex]
2.
[tex]3x+y=12[/tex]
[tex]y=6[/tex]
[tex]3x+6=12[/tex]
[tex]3x=6[/tex]
[tex]x=2[/tex]
3.
[tex]\left \{ {{y=6} \atop {x=2}} \right.[/tex]