What is the slope of a line through the points (-3 , 5 ) and ( 1 , -7 ) ? a 1/2 b -3 c 1/2 d 2

Which lines are parallel? justify your answer. lines p and q are parallel because same side interior angles are congruent. lines p and q are parallel because alternate exterior angles are congruent lines l and m are parallel because same side interior angles are supplementary lines l and m are parallel because alternate interior angles are supplementary.