Can you show that this quadrilateral is a parallelogram?

Which is the equation of a line perpendicular to the line with the equation 3x+4y=8

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.

Complete this sentence with the best of choices given