Identifying Independent and Dependent Variables

What is the independent variable?

The number of students in a class, s, and the number of desks needed, d

• number of students in a class, s

• number of desks needed, d

• number of desks in a class, d

• number of students needed, s

What is the independent variable?

The number of gallons of paint needed, g, and the size of a room in square feet, s

• number of gallons of paint needed, g

• the size of the room in square feet, s

What is the dependent variable?

The number of students in a class, s, and the number of desks needed, d

• number of students in a class, s

• number of desks needed, d

• number of desks in a class, d

• number of students needed, s

What is the independent variable?

The number of candles on a birthday cake, c, and that person's age, a

• number of candles on a birthday cake, c

• that person's age, a

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

• 2x

• x

• -4

• y

The dependent variable is:

• x

• y

Which is the dependent variable?

• x

• y

• -1/2

• 4

Which is the dependent variable?

• x

• y

• -1/2

• 4

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

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