Quadrilateral wxyz is on a coordinate plane. segment xy is on the line x − y = −3, and segment wz is on the line x − y = 1. which statement proves how segments xy and wz are related?
a. they have slopes that are opposite reciprocals of 1 and −1 and are, therefore, perpendicular.
b. they have the same slope of 1 and are, therefore, parallel.
c. they have slopes that are opposite reciprocals of 0 and undefined and are, therefore, perpendicular.
d. they have the same slope of −1 and are, therefore, parallel.