Respostas

2013-11-21T22:31:17-02:00
  \left[\begin{array}{ccc}x&y&1\\-1&-2&1\\-2&3&1\end{array}\right] 





 (-1,-2) e (-2,3)  x    y 1  x  y-1  -2 1 -1 -2-2   3  1 -2 3
-2x -2y -3 - ( 4 + 3x -y) = 0
-2x -2y -3 -4 -3x -y = 0
-5x -3y -7 = 0  .(-1)
5x + 3y + 7 = 0 
2013-11-22T00:12:43-02:00
 (-1,-2) e (-2,3)  x    y 1  x  y-1  -2 1 -1 -2-2   3  1 -2 3
-2x -2y -3 - ( 4 + 3x -y) = 0
-2x -2y -3 -4 -3x -y = 0
-5x -3y -7 = 0  .(-1)
5x + 3y + 7 = 0