RATE OF CHANGE- PROPORTIONAL

Which of the following does NOT have a constant rate of change?

• (2, 5) (4,13) (5,17)

• (9,1) (11, 2) (12, 3)

• (3, 7) (4, 9) (5, 11)

• (1,3) (3, 9) (6, 18)

Jon paid $120 towards his cell phone plan for 3 months. For 5 month he paid $200. What equation best represents the relationship between the months and cost of his cell phone.

• x = 40y

• x = 30y

• y = 40x

• y = 30x

What equation best represents the table below

• y = 1.1x

• y = 10x

• y = 5.5x

• y = 1.5x

What equation best represents the relationship in the graph

• y = 7x

• y = 2x

• y = -3x

• y = 3x