Step by step what is -1/3 divided by 1/2

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.