equação geral da reta que passa pelos pontos A (3,7)e B(8,5)
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Escreva primeiro a equação na forma matricial:
![\left|\begin{array}{ccc}x&y&1\\3&7&1\\8&5&1\end{array}\right| =0\\
\\
7x+8y+15-56-3y-5x=0\\
\\
\boxed{2x+5y-41=0} \left|\begin{array}{ccc}x&y&1\\3&7&1\\8&5&1\end{array}\right| =0\\
\\
7x+8y+15-56-3y-5x=0\\
\\
\boxed{2x+5y-41=0}](https://tex.z-dn.net/?f=++%5Cleft%7C%5Cbegin%7Barray%7D%7Bccc%7Dx%26amp%3By%26amp%3B1%5C%5C3%26amp%3B7%26amp%3B1%5C%5C8%26amp%3B5%26amp%3B1%5Cend%7Barray%7D%5Cright%7C+%3D0%5C%5C%0A%5C%5C%0A7x%2B8y%2B15-56-3y-5x%3D0%5C%5C%0A%5C%5C%0A%5Cboxed%7B2x%2B5y-41%3D0%7D)
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