Respostas

2013-05-18T13:10:54-03:00

3x+5y=11

2x-y=4 .(5)

=

3x+5y=11

+

10x-5y=20

=

13x=31

x=31/13

 

3.31/13+5y=11

93/13+5y=11

93/13-11=-5y

-3.8=-5y

-3.8/-5=y

y=0,76