Question

The slope of AB is 3/4. The slope of CD is 12/a. Determine the value of 'a' if AB ⊥ CD.

Also, what does "⊥" mean?

Answer 1

Answer:

thiseans perpendicular. trans port this a up words

Answer 2

Answer:

if AB and CD are perpendicular

(slope of AB)×(slope of CD) =-1

(3/4)×(12/a) = -1

9/a = -1

a = -9