Mathletes 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 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 height of a sunflower in inches, h, and the number of days since it was planted, p

• number of days the sunflower grows, g

• number of days since the sunflower was planted, p

• height of a sunflower in inches, h

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

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

• 2x

• x

• -4

• y

Which is the dependent variable?

• x

• y

• -1/2

• 4

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

• y

• x

• -2

• 3x

The dependent variable is:

• x

• 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