Question

If AD is the altitude to BC, what is the slope of AD?

A. 1/3
B. 2/3
C. 3
D. −1/3

Answer 1

9514 1404 393

Answer:

C. 3

Explanation:

AD is perpendicular to BC, so its slope will be the opposite of the reciprocal of the slope of BC.

The slope of BC can be found from the slope formula:

m = (y2 -y1)/(x2 -x1)

m = (-1 -2)/(3 -(-6)) = -3/9 = -1/3

Then the slope of AD is ...

-1/(-1/3) = 3