Respostas

2014-02-04T12:33:36-02:00
\[\\x+y=120 \\\\\frac{x}{y}=\frac{4}{6}\]


x=120-y
x/y=4/6

120-y/y=4/6

4y=720-6y
4y+6y=720
10y=720
y=720/10
y=72

x+y=120
x+72=120
x=120-72
x=48