seja r a reta que passa pelos pontos [1,2] e [-2,5] determine a equacao geral de r
Soluções para a tarefa
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Olá !
Resolução :
![\left[\begin{array}{ccc}1&2&1\\-2&5&1\\x&y&1\end{array}\right\left]\begin{array}{ccc}1&2&\\-2&5&\\x&y&\end{array}\right](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B2%26amp%3B1%5C%5C-2%26amp%3B5%26amp%3B1%5C%5Cx%26amp%3By%26amp%3B1%5Cend%7Barray%7D%5Cright%5Cleft%5D%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B2%26amp%3B%5C%5C-2%26amp%3B5%26amp%3B%5C%5Cx%26amp%3By%26amp%3B%5Cend%7Barray%7D%5Cright+ "\left[\begin{array}{ccc}1&2&1\\-2&5&1\\x&y&1\end{array}\right\left]\begin{array}{ccc}1&2&\\-2&5&\\x&y&\end{array}\right")
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5 + 2X - 2Y - 5X - Y + 4 = 0
2X - 5X - 2Y - Y + 5 + 4 = 0
-3X - 3Y + 9 = 0 (-1)
3X + 3Y - 9 = 0
X + Y - 3 = 0
Resposta :
X + Y - 3 = 0
Resolução :
________________________________
5 + 2X - 2Y - 5X - Y + 4 = 0
2X - 5X - 2Y - Y + 5 + 4 = 0
-3X - 3Y + 9 = 0 (-1)
3X + 3Y - 9 = 0
X + Y - 3 = 0
Resposta :
X + Y - 3 = 0
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