Find the slope of the line that goes through the given points.
(3, 5) and (3, -5)

For this case we have that by definition, the slope of a line

is given by:

Where:

are two points through which the line passes.

According to the statement we have:

Substituting we have:

It is noted that the slope is undefined.

The slope is undefined

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true