Dados los punto P(−8, −12) Q(4, −4a) y a la recta l : 9y = −6x + 3.
Determine:
a) La ecuación de recta que pasa por los puntos P y Q. (lP Q).
b) Determine (si es posible) el valor de a para que la recta l sea perpendicular
a la recta lP Q
c) Considerando el resultado obtenido en b. determine el punto de intersección
entre la recta l y la lP Q

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