Respostas

2014-08-22T19:31:59-03:00
X=copos
Y=coxinhas

2x+3y=5,70 .(3)
3x+5y=9,30 .(-2)

6x+9y=17,10 Agr some as equacoes
-6x-10y=-18,60

0x-y=-1,50
-y=-1,50 .(-1)
Y=1,50 reais

2x+3y=5,70
2x+3.1,50=5,70
2x+4,50=5,70
2x=5,70-4,50
X=1,20/2
X=0,60 reais ou 60 centavos

Espero ter ajudado
5 4 5