Question 4 • Mathematics 8
In choice D, the endpoints (1, 4) and (2, 1) form a side with slope (1 − 4)/(2 − 1) = −3. The endpoints (4, 4) and (5, 1) form another side with slope (1 − 4)/(5 − 4) = −3. Both slopes are negative, so the correct choice is the set of endpoints (1, 4), (2, 1), (5, 1), and (4, 4).
AI-written and checked against the verified answer.