Question

The graph below represents the price of sending text messages using the services of a phone company. What is the constant of proportionality?

A graph is shown. The values on the x axis are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. The values on the y axis are 0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80. Points are shown on ordered pairs 0, 0 and 2, 16 and 4, 32 and 6, 48 and 8, 64. These points are connected by a line. The label on the x axis is Text Messages Sent. The label on the y axis is Price in cents.

(1 point)

Group of answer choices

8

14

16

48

Answer 1

To find the constant of proportionality, we need to examine the relationship between the number of text messages sent (x axis) and the price in cents (y axis). Looking at the points on the graph, we can see that for every 2 text messages sent, the price increases by 16 cents.

Therefore, the constant of proportionality is 16.