Name ________________________________________ Date _________________________ Per _________
Independent and Dependent Variables in Tables and Graphs
Reteach
Give the relationship (rule) between x and y.
1.
________________________________________________________________________________________
2. a. What is y when x 2?
___________________________
b. What value of x gives y 2?
___________________________
c. Write the equation for the graph.
___________________________
Practice and Problem Solving: D
Answer the questions for each real-world situation. The first one is done for you.
1. The table gives the amount of water in a water tank as it is being filled.
Gallons
50
100
150
200
250
Time (min)
10
20
30
40
50
a. Why is gallons the dependent variable?
____________________________________________________________________________________
b. Divide gallons by time in each pair of cells. What do you get?
____________________________________________________________________________________
c. If the time is 60 minutes, explain how would you get the gallons? What would you get?
Answer each question using the graph.
3. How many sandwiches are available at the start of the business day?
________________________________________
4. Which axis shows the dependent variable, sandwiches?
________________________________________
5. How many sandwiches are left after 20 minutes?
________________________________________
LESSON
12.2
x
1
2
3
4
5
y
3
4
5
6
7
LESSON
12.2
Practice and Problem Solving: A/B
Name the dependent variable and the independent variable in each problem.
1. A food service worker earns $12 per hour. How much money, m, does the worker earn on a shift of h
hours?
Dependent variable: _________________________; independent variable: _________________________
2. A large 2-topping pizza, L, costs $2 more than a medium 3-topping pizza, M.
Dependent variable: __________________________; independent variable: ________________________
The table shows the electric current produced by a solar cell in different amounts of sunlight (light
intensity). Answer the questions using the data.
Light
intensity
150
300
450
600
750
900
Electric
Current
10
30
45
60
75
90
3. What is the dependent variable? 4. What is the independent variable?
________________________________________ ________________________________________
5. What do you predict the current will be in the absence of sunlight? Explain.
________________________________________________________________________________________
6. What do you predict the current will be if the light intensity is 1,000? Explain.
________________________________________________________________________________________
A race car driver’s time in seconds to
complete 12 laps is plotted on the graph.
7. Which axis shows the dependent
variable?
________________________________________
LESSON
12.2
