Let A (1, –2), B (6, –2), C(5, 1) and D (2, 1) befour points.

Let A (1, –2), B (6, –2), C(5, 1) and D (2, 1) be
four points.

Match the items on the right to the items on the left.

Find the slope of the line segments
(a) AB (b) CD

Find the slope of the line segments
(a) BC (b) AD

What can you deduce from your answer?