Nina claimed that if you graph the ordered pairs from a table and they form a straight line, it is a
proportional relationship. May-Lin said that is not always true. Sketch a graph that supports Nina’s
claim and sketch a different graph that shows why a graph that forms a straight line is not always
proportional.

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.