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. • 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? • 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. 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. 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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