Respuesta:
[tex]R//: x=9 ; y=10[/tex]
Explicación paso a paso:
[tex]\left \{ {{3x+y=37} \atop {3x+4y=67}} \right. \\\\\left \{ {{3x+y=37}(-1) \atop {3x+4y=67}} \right.\\\\\left \{ {{-3x-y=-37} \atop {3x+4y=67}} \right.\\-------\\3y=30\\y=30/3\\y=10\\\\3x+y = 37\\3x+10 = 37\\3x=37-10\\3x=27\\x=27/3\\x=9[/tex]
