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2014-05-16T00:53:07-03:00
  \left[\begin{array}{ccc}x&y&1\\-3&8&1\\5&-2&1\end{array}\right] =0


8x + 5y + 6 - 40 + 3y + 2x = 0 

10x + 8y -34 = 0
1 5 1
2014-05-16T01:02:27-03:00
|-3 8 1 -3 8
| 5 -2 1 5 -2
| x y 1 x y

6+8x +5y +2x +3y -40
10x + 8y - 34 (÷2)
5x + 4y -17