Respostas

2014-06-26T14:33:44-03:00
3b=21a+1    3b=21.0,37+1   3b=8,77 b=8,77/3  b=2,923

33(3a-21a-1)=-11
99a -693a -33= -11
-594a=22 (.-1)
594a=-22
a=-22/594
a=0,037            

espero ter ajudado