Final answer:
The equation of the altitude CD in Triangle ABC is x - 2y = -6.
Step-by-step explanation:
Given that CD bisects AB in Triangle ABC, we can find the equation of the altitude CD.
First, let's recall that an altitude of a triangle is a line segment from a vertex perpendicular to the opposite side. Since CD is the altitude, it is perpendicular to AB.
Therefore, the equation of the altitude CD is x - 2y = -6, which is option B.