Quadrilateral wxyz is on a coordinate plane. segment xy is on the line x − 3y = −12, and segment wz is on the x − 3y = −6. which statement proves how segments xy and wz are related?

they have opposite reciprocals slopes of one third and −3 and are, therefore, perpendicular.
they have the same slope of negative one third and are, therefore, parallel.
they have opposite reciprocals slopes of negative one third and 3 and are, therefore, perpendicular.
they have the same slope of one third and are, therefore, parallel.