Respostas

2014-05-09T16:24:19-03:00
X=30+y
x+y-10=38

X=48-y
 
48-y=30+y
2y=78
y=39

R= 69 anos
fiquei em dúvida (??

x=30+y
x+y=38
x=38-y

38-y=30+y
2y=68
y=34

x=34+30

x=64


2014-05-09T16:25:33-03:00
X+y=38
y+7=3(x+7)

x+y=38
y+7=3x+21
y=3x+21-7
y=3x+14

x+3x+14=38
4x+14=38
4x=24
x=6

y=32