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.

    Ten ovals and two squares.

  • 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 girls’ 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 graph of number of calories burned while 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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Table of Contents

Digits, Grade 7, Volume 1, Homework Helper Unit A: Number and Operations Unit B: Expressions, Equations, and Relationships Unit C: Measurement and Geometry Unit D: Proportionality English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties