Respuesta :

you subsitute 11-2y/7  when you do that you get -2 11-2y/7 +3y=29: y=9  isolate y   -2 11-2y/ +3y=29 y=9 
 x= 11-2 . 9/7 x= -1 
 Y=9 X=-1
X=1 y=2 for the first one