A equação geral da reta que passa pelos pontos A (1,2) e B (2,0) é?
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Você irá usar o determinante para achar a eq. da Reta!
![\left[\begin{array}{ccc}x&y&1\\1&2&1\\2&0&1\end{array}\right]
\left[\begin{array}{ccc}x&y\\1&2\\2&0\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dx%26amp%3By%26amp%3B1%5C%5C1%26amp%3B2%26amp%3B1%5C%5C2%26amp%3B0%26amp%3B1%5Cend%7Barray%7D%5Cright%5D+++%0A%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dx%26amp%3By%5C%5C1%26amp%3B2%5C%5C2%26amp%3B0%5Cend%7Barray%7D%5Cright%5D+%0A%0A "\left[\begin{array}{ccc}x&y&1\\1&2&1\\2&0&1\end{array}\right]
\left[\begin{array}{ccc}x&y\\1&2\\2&0\end{array}\right]")
2x + 2y + 0 - 4 - x - y = 0
x + y - 4 = 0
2x + 2y + 0 - 4 - x - y = 0
x + y - 4 = 0
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