### Home > CCA2 > Chapter 1 > Lesson 1.1.2 > Problem1-23

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. Answer (a):The more gas you buy, the more money you spend.Gallons are independent and dollars are dependent. b. Answer (b):People grow a lot in their early years, and then their growth slows. Age is independent and height is dependent. c. Answer (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. Answer (d):As the number of students grows, more classrooms are used and each classroom holds 30 students.I: students, D: classrooms. e. What are all of the possible inputs of the graph in part (d)? What are all of the possible outputs?Answer (e):Possible inputs: x can be any number between and including 0 and 120.Possible outputs: $y=1,2,3,4$.