Question

If AB is parallel to CD and the slope of CD is -5, what sis the slope of AB?

A. -1/5
B. 5
C. 1/5
D. -5

Answer 1

The answer is D. -5

Explanation:

Since AB is parallel to CD, their slopes are the same. Parallel actually means to have the same slope.

Answer 2

For this case we have that, by definition if two lines are parallel, then their slopes are equal, that is:

`m_ {1} = m_ {2}`

In this case we have that the slope of the line CD is:

`m_ {2} = - 5`

If CD is parallel to AB, we are asked to find the slope of AB.

So:

`m_ {1} = m_ {2} = - 5`

Answer:

Option D