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2014-02-09T15:38:47-02:00
X-y= 6 (-1)
x+y= -7

-x+y= -6
x+y= -7

2y= -13
y= -13
        2

x-y= 6
x-(-13/2)= 6
x+13= 6
    2
x= 6 - 13
            2
x= -1/2

S={-1/2, -13/2)
3 5 3
2014-02-09T15:48:24-02:00
X-x-y= 4+6-7
x-y=10-7
x-y=3
y=x/3 
2 4 2