Segment ab is on the line y − 9 = −4(x + 1), and segment cd is on the line y − 6 = one fourth(x − 3). which statement proves the relationship of segments ab and cd?
a. they are perpendicular because they have slopes that are opposite reciprocals of 4 and negative one fourth.
b. they are parallel because they have the same slope of 4.
c. they are perpendicular because they have slopes that are opposite reciprocals of −4 and one fourth.
d. they are parallel because they have the same slope of negative one fourth.