Respostas

2014-06-22T23:58:31-03:00
P(2,-3) r: x+2y+5=0

  \left[\begin{array}{ccc}x&y&1\\2&-3&1\\1&2&1\end{array}\right]   \left[\begin{array}{ccc}x&y&\\2&-3&\\1&2&\end{array}\right]
Então ficaria:
-3x+y+4-2y-2x+3=0
-5x-y+7=0

Espero ter ajudado. (: