Respostas

2014-03-21T16:42:36-03:00
 \frac{x}{y} = \frac{3}{4} \\\\x=  \frac{ 3y}{4}

sabendo que x vale 3y/4
substitui x na outra equação
x+y=35\\\\ \frac{3y}{4}+y =35\\\\ \frac{3y.1 +y.4}{4}  =35\\\\ \frac{3y+4y}{4}  =35\\\\ \frac{7y}{4} =35\\7y=35.4\\\\7y=140\\\\y= \frac{140}{7}=20

y vale 20

x+y = 35
x+20 = 35
x=35-20
x=15

x=15
y=20
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