Respuestas

2014-01-30T17:46:48+01:00
37x + 13y =137
13x + 37y =113

x=137-13y/37=113-37y/13
(137-13y).13=(113-37y).37
1781-169y=4181-1369y
1369y-169y=4181-1781
1200y=2400
y=2400/1200=2
x=137-13y/37=137-13.2/37=111/37=3