### 7-2: TEKS Practice

• 1. The variable y is in a proportional relationship with x. The number of squares represents an x-value. The number of ovals represents the corresponding y-value. Identify the constant of proportionality.

• 2. Suppose the relationship between x and y is proportional. When x is 6, y is 78. Identify the constant of proportionality of y to x.

• 3. Since a middle school opened, the girlsâ€™ basketball team has had the same record every season. The team has won a total of 169 games while losing only 13 games. Find the constant of proportionality of wins to losses.

• 4. Does the table show a proportional relationship? If so, what is the constant of proportionality of y to x?

• 5. The distance a jet aircraft flies has a proportional relationship with its number of hours in flight. The table shows the number of miles flown for a number of hours in flight.

• a. Find the constant of proportionality.

• b. How long will the jet take to travel 4,620 miles?

• 6. The height of a stack of DVD cases is in a proportional relationship to the number of cases in the stack. A stack of 6 cases and its height are shown.

• a. What is the constant of proportionality in millimeters per DVD case?

• b. What is the height of 13 DVD cases in millimeters?

• 7. Estimation The graph shows the number of calories burned while running. Estimate the constant of proportionality of calories burned to time spent running.

• a. The constant of proportionality is about how many calories per minute?

• b. What does the point (35, 315) represent?

• A. 315 calories burned in 35 minutes

• B. 35 calories burned in 315 minutes

• C. 315 calories burned in 1 minute

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