Resposta :

3478elc
x - y = 40
x = 5y ==> x = 5.10 = 50==> x = 50

5y - y = 40
4y = 40

y=10
carloswms2012
x-y=40--------->    x-y=40(-1) --------->  -x+y= -40
x=5y------------>   x-5y=0    ----------->   x-5y= 0


y-5y=-40+0
-4y=-40
4y=40
y=40/4
y=10

x-y=40
x-10=40
x=40+10
x=50


são esses os numeros 10 e 50

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