) Qual é a equação da reta r, paralela à reta que passa pelos pontos (2 , 3) e (1 ,– 4) ?
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P(x, y)
A(2, 3)
B(1, - 4)
![\left|\begin{array}{ccc}x&y&1\\2&3&1\\1&- 4&1\end{array}\right| = 0 \\ \\ \\\: [(3 - (- 4)]x + (2 - 1)y + 2(- 4) - 1- 3 = 0 \\ 7x + y - 8 - 4 = 0 \\ 7x + y - 12 = 0](https://tex.z-dn.net/?f=++++%5Cleft%7C%5Cbegin%7Barray%7D%7Bccc%7Dx%26amp%3By%26amp%3B1%5C%5C2%26amp%3B3%26amp%3B1%5C%5C1%26amp%3B-+4%26amp%3B1%5Cend%7Barray%7D%5Cright%7C+%3D+0+%5C%5C+%5C%5C+%5C%5C%5C%3A+%5B%283+-+%28-+4%29%5Dx+%2B+%282+-+1%29y+%2B+2%28-+4%29+-+1-+3+%3D+0+%5C%5C+7x+%2B+y+-+8+-+4+%3D+0+%5C%5C+7x+%2B+y+-+12+%3D+0 "\left|\begin{array}{ccc}x&y&1\\2&3&1\\1&- 4&1\end{array}\right| = 0 \\ \\ \\\: [(3 - (- 4)]x + (2 - 1)y + 2(- 4) - 1- 3 = 0 \\ 7x + y - 8 - 4 = 0 \\ 7x + y - 12 = 0")
A(2, 3)
B(1, - 4)
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