Identifying the Independent and Dependent Variables

Name the DEPENDENT variable from the table below.

• minutes

• bubbles

What is the dependent variable according to the graph?

• The dependent variable is total cost

• The dependent variable is weight

• The dependent variable is unknown

On a graph, which axis shows the independent variable?

• x-axis

• y-axis

• neither

• it changes

Changes in the _________ variable causes changes in the _________ variable.

• independent; dependent

• dependent; independent

A phone company charges a base rate of $40 a month for service. The user is charged $0.20 a minute for every minute used. The total amount charge to the customer, p, for any number of minutes, m, can be represented by the function
p = .2m + 40.
What is the dependent variable?

• The # of minutes used

• The base rate of $40

• The total amount charged to the customer

• The $0.20 per minute

What is the dependent variable in the equation y = 3x - 2?

• y

• x

• -2

• 3x

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

The dependent variable is:

• x

• y

Which is the dependent variable?

• x

• y

• -1/2

• 4

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

• 2x

• x

• -4

• y