Question

Use the interactive graph to plot each set of points. Which sets represent proportional relationships? Check all that apply.
(3, 1), (6, 2), (9, 3)
(2, 4), (4, 6), (7, 9)
(1.5, 3), (3, 6), (4, 8)
(3, 1), (4, 3), (8, 6)

Answer 1

The 1st and 3rd sets.

- (3,1), (6,2), (9,3): y/x = 1/3 for every point → proportional (k = 1/3).
- (1.5,3), (3,6), (4,8): y/x = 2 for every point → proportional (k = 2).

The 2nd and 4th sets do not have a constant y/x, so they are not proportional.