Respostas

2014-06-03T10:08:59-03:00
X+y=175 
x-y=19 

x=175-y

175 -y - y = 19 
-2y = 19-175 
-2y = -156 
y= 78 

x + y = 175 
x + 78= 175 
x= 97

2014-06-03T10:10:08-03:00
X+y=175
x-y=19        x=19+y

x+y=175
19+y+y=175
19+2y=175
2y=175-19
2y=156
y=156/2
y=78

x+y=175
x+78=175
x=175-78
x=97

Resposta: 97 e 78