Digits, Grade 8, Volume 1, Homework Helper

2-4: TEKS Practice

  • 1. The points (15, 21) and (25, 35) form a proportional relationship.

    • a. Find the slope of the line through the points.

    • b. Draw a graph which represents this relationship.

  • 2. Your neighbor burns 117 Calories in 13 minutes cross-country skiing. There is a proportional relationship between Calories burned and time.

    • a. Find the unit rate.

    • b. Draw a graph which represents the relationship between time and Calories burned.

  • 3. The graph represents an object slowing to a stop. Find two points on the line and use them to find the slope of the line.

    A graph.

  • 4. Think About the Process The graph shows the relationship between the cost in dollars of the taxi ride and the distance in miles the taxi travels.

    • a. How can you find the slope of the line?

    • b. What is the slope?

    A graph.

  • 5. Error Analysis A question on a test asks students to find the speed at which a car travels. The graph shows a proportional relationship between the distance traveled in miles and time in hours. Anna incorrectly says that the speed of the car is 1 sixty fourth mile per hour.

    A graph.

    • a. What is the speed of the car?

    • b. What error might Anna have made?

  • 6. Writing The graph shows a proportional relationship between the number of workers and weekly cost in dollars for a company.

    A graph titled Weekly Costs. The x-axis is Number of Workers. The y-axis is Weekly Cost ($).

    • a. Use the points (7, 5,250) and (12, 9,000) to find the weekly cost for the company for each worker.

    • b. Describe what a unit rate is used for.


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Table of Contents

Digits, Grade 8, Volume 1, Homework Helper Unit A: Number and Operations Unit B: Proportionality Unit C: Expressions, Equations, and Relationships English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties