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Y - b = (X - a)(B - b)/(A - a)
1).- PUNTOS: A(1, 6) Y B(3, 9)
Y - 6 = (X - 1)(9 - 6)/(3 - 1)
Y - 6 = (X - 1)(3)/(2)
Y - 6 = 3X/2 - 3/2
Y = 3X/2 - 9/2
2).- PUNTOS: A(-1, 0) y B(0, 4)
Y - 0 = (X - -1)(4 - 0)/(0 - -1)
Y = (X + 1)(4)/(1)
Y = (X + 1)(4)
Y = 4X + 4
3).- PUNTOS: A(-3,6) y B(2, -4)
Y - 6 = (X - -3)(-4 - 6)/(2 - -3)
Y - 6 = (X + 3)(-10)/(5)
Y - 6 = (X + 3)(-2)
Y - 6 = -2X - 6
Y = -2X