Question

Which graph shows a proportional relationship?
On a coordinate plane, points (2, 3), (3, 8), and (6, 9) are plotted.
On a coordinate plane, points (2, 4), (3, 6), and (5, 10) are plotted.
On a coordinate plane, points (1, 3), (4, 4), and (5, 10) are plotted.
On a coordinate plane, points (2, 9), (5, 4), and (9, 3) are plotted.

Answer 1

The second set: (2, 4), (3, 6), (5, 10).

Each point has y/x = 2, so they lie on the line y = 2x (a line through the origin), which is a proportional relationship.