Resposta:
Boa noite!
Explicação passo-a-passo:
[tex]\left \{ {{x=3y} \atop {2x-4y=6}} \right. ||x=3y\\\\2.(3y)-4y=6\\\\6y-4y=6\\\\2y=6\\\\y=6/2\\\\y=3\\\\\\x=3y\\\\x=3*3\\\\x=9[/tex]
