Respuesta :
the first one is : x=3/2y+21/2
the second one is: x=1/3y+−7/6
the second one is: x=1/3y+−7/6
y= 10
2x-3y=21
2x=21+3y
x= (21/2 +3/2 y)
-6(21/2+3/2y)+2y=7
126/2+18/2y+2y=7
sorry I need to leave now