Independent & Dependent Variable

Which label best describes the independent quantities shown in the table?

• Number of tickets (t)

• Cost (c)

On a graph, which axis shows the independent variable?

• x-axis

• y-axis

• neither

• it changes

On a graph, which axis shows the dependent variable?

• x-axis

• y-axis

• neither

• it changes

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 number of treats

s = the number of students

Which of the variables is INDEPENDENT?

• s

• t

Which of the following is the label for the independent variable.

• Money Collected

• Raising Money

• Boxes Sold

• None of the above

Grace is bringing treats to her Algebra 1 class on her birthday. The number of treats she brings is based on the number of students in her class.

Which of the variables is independent?

• number of students

• number of treats

When Jane exercises on an elliptical machine, her initial heart rate is 90 beats per minute. She warms up at this rate for 5 minutes. Over the next 5 minutes, she gradually increases to 150 beats per minute. She maintains that rate for 15 minutes before gradually decreasing back to her original heart rate at the end of her 30-minute workout. The dependent variable in this scenario is ___________

A city discovers that its population has been tripling every year. The dependent variable in this scenario is __________

A vacationer has $300 to spend over the next 20 days. The first two days, she spends $20 on food each day. She visits with a family member for the next four days and does not spend any money. She then spends $20 on transportation on each of the remaining days until she spends all of her money. The dependent variable in this scenario is _________

What best describes the unit rate of the linear function shown?

• 20 gallons of water per load of laundry

• 25 gallons of water per load of laundry

• 40 gallons of water per load of laundry

• 50 gallons of water per load of laundry