### Home > CCA2 > Chapter 1 > Lesson 1.1.2 > Problem 1-23

Examine each graph below. Based on the shape of the graph and the labels of the axes, write a sentence to describe the relationship that each graph represents. Then state which axis represents the independent variable and which one represents the dependent variable. Homework Help ✎

a. | The more gas you buy, the more money you spend. | b. | People grow a lot in their early years, and then their growth slows. Age is independent and height is dependent. |

c. | As time goes by, the ozone concentration goes down, although the effect is slowing. The year is independent and the ozone is dependent. | d. | As the number of students grows, more classrooms are used and each classroom holds 30 students. |

e. What are all of the possible inputs of the graph in part (d)? What are all of the possible outputs? Possible inputs: |