Respostas

2013-08-22T21:32:11-03:00
x/y=4/5
x = 4y/5


x + y = 54
4y/5 + y = 54
20y + 5y = 270
25y = 270
y = 270/25
y = 10,8

x = 4y/5
x = 4*10,8/5
x = 8,64

Resposta
x = 8,64
y = 8,64