The ratio of red cars to blue cars in a parking lot was 9 : 5. If there were 54 red cars, how many blue cars were there?

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.