Independent and Dependent Variable

Sarah is bringing treats to her elementary school class on her birthday. The number of treats she brings in is based on the number of students in her class.

t = the total number of treats

s = the number of students

Which of the variables is independent?

• s

• t

Carey and Justin are raising money to purchase books for their school's library. The more money they raise, the more books they will be able to purchase for the library. m = the amount of money Carey and Justin raise b = the total number of books Carey and Justin will be able to purchase Which of the variables is dependent?

• m

• b

In order to earn extra money on the weekends, Josie's string quartet performs at wedding receptions. The longer the reception, the more money they earn.

r = the length of the reception

m = the total amount of money Josie's quartet earns

Which of the variables is independent?

• r

• m

Kira designs websites. She can create three different websites each week. Kira wants to create an equation that will give her the total number of websites she can design given the number of weeks she works. What is the independent variable?

• the number of websites she makes

• the number of weeks

• the design of the website

• there isn't one

• a

• b

• c

• d

Match the following using the given graph of a two-variable equation.

• Velocity in m/s

• Time it takes to reach a velocity of 20 m/s

• Time in seconds

• Equation

• 8 m/s

• Dependent Variable x

• y = 4x

• Independent Variable y

• 5 seconds

• Velocity after 2 minutes

In the equation y = 2x - 4, what is the dependent variable?

• 2x

• x

• -4

• y

Elizabeth hired a cleaning service to clean her house. To find C, the total cost of cleaning her house, she used the following equation.

C = 7.5x + 25

What is the dependent variable for the equation?

• 7.25

• 25

• C

• x

Which is the dependent variable?

• x

• y

• -1/2

• 4

Which is the dependent variable?

• x

• y

• -1/2

• 4