1. The amount of time Gareth spends studying and his test scores have a proportional relationship. Complete the table.
2. Think About the Process The temperature 100 ft below sea level is 33°F. The temperature at sea level is 53°F. The temperature drops 2°F every 1,000 ft above sea level. Let x be the distance above sea level in thousands of feet. Let y be the temperature.
a. Express the relationship between x and y with an equation.
b. Is the relationship between x and y proportional?
c. The temperature 5,000 ft above sea level is °F.
d. What given information did you not use to solve this problem?
A. The rate of change of the temperature
B. The temperature at sea level
C. The temperature 100 ft below sea level
3. The table shows a proportional relationship between x and y. Complete the table. Simplify your answers.
4. Suppose you are waiting in a line. The time it takes for you to reach the front depends on the number of people ahead of you. This is shown in the table. Does the table show a proportional relationship?
5. Think About the Process The number of songs on a CD and the length of the CD have a proportional relationship.
a. Which operation should you use to find the ratios?
A. Multiplication
B. Subtraction
C. Division
D. Addition
For parts (b) through (d), complete the table.
6. Megan's father is preparing y gift bags for guests at Megan's graduation party. Her father buys 5 more gift bags than the number of guests x.
a. Express the relationship with an equation.
y =
b. Is the relationship between x and y proportional?