Question

Side AB of parallelogram ABCD has endpoints at (-1,6) and (6,9). What is the slope of the opposite side, CD?

A. 7/3
B. -7/3
C. 3/7
D. -3/7

Answer 1

3/7

Explanation:

Opposite sides on a parallelogram are parallel, and parallel lines have the same slope, so once we find the slope of AB, we'll know the slope of CD. Point A is (-1,6) and point B is (6,9), so the slope of AB (and by extension, CD) is

`(9-6)/(6-(-1))=(3)/(7)`