2.2.5.PRETEST: Independent and Dependent Variables

Zack gets paid $8 per hour to babysit. The amount of money he earns depends on the number of hours he babysits.

Which is the dependent variable, and which is the independent variable?

• The dependent variable is the amount of money he earns, and the independent variable is the number of hours he babysits.

• The dependent variable is the number of hours he babysits, and the independent variable is the amount of money he earns.

• The dependent variable is the ages of the children, and the independent variable is the amount of money he earns.

• The dependent variable is the amount of money he earns, and the independent variable is the ages of the children.

Tom gets paid $12 for every lawn he mows. The amount of money he earns depends on the number of lawns he mows.

Which is the dependent variable, and which is the independent variable?

• The dependent variable is the amount of money he earns, and the independent variable is the number of lawns he mows.

• The dependent variable is the number of lawns he mows, and the independent variable is the amount of money he earns.

• The dependent variable is the area of the lawn, and the independent variable is the amount of money he earns.

• The dependent variable is the amount of money he earns, and the independent variable is the area of the lawn.

Russel gets paid $10 for every yard he rakes. The amount of money he earns depends on the number of yards he rakes.

Which is the dependent variable, and which is the independent variable?

• The dependent variable is the amount of money he earns, and the independent variable is the number of yards he rakes.

• The dependent variable is the number of yards he rakes, and the independent variable is the amount of money he earns.

• The dependent variable is the size of the yard, and the independent variable is the amount of money he earns.

• The dependent variable is the amount of money he earns, and the independent variable is the size of the yard.

All the students in a history class complete a 10-point extra-credit assignment to raise their test scores.

The new test score is 10 points more than the original score.

Let x = original score

Let y = new score

Write an equation that represents this situation.

• y = x + 10

• y = x – 10

• y = 10x

• y = x ÷ 10

All the students in a science class complete a 15-point extra-credit assignment to raise their test scores.

The new test score is 15 points more than the original score.

Let x = original score

Let y = new score

Which equation represents this situation?

• y = x + 15

• y = x – 15

• y = 15x

• y = x ÷ 15

All the students in a math class complete a 12-point extra-credit assignment to raise their test scores.

The new test score is 12 points more than the original score.

Let x = original score

Let y = new score

Which equation represents this situation?

• y = x + 12

• y = x – 12

• y = 12x

• y = x ÷ 12

Sunita packs 3 meals for each day she camps. The number of meals she packs depends on the number of days.

Select the graph with the correctly labeled axes for this situation.

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Ken, the camp cook, makes 3 meals for every camper. The number of meals he makes depends on the number of campers.

Select the graph with the correctly labeled axes for this situation.

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A parking garage charges each car $2 per hour to park. The total cost depends on the number of hours parked in the garage.

Select the graph with the correctly labeled axes for this situation.

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A bookstore is having a sale. Every book is $2 off, regardless of the original price.

The sale price for every book is $2 less than the original price.

Let x = original price

Let y = sale price

Which equation represents this situation?

• y = x – 2

• y = x + 2

• y = 2x

• y = x ÷ 2