Digits, Grade 8, Volume 1, Homework Helper

### 2-1: TEKS Practice

• 1. An airline company rewards the customers who fly often with a frequent flyer program. The airline will give their customers 450 points for every 3 flights that they take. Draw a graph which models this situation.

• 2. A class is having a bake sale. The class earns 15 cents for each cookie sold.

• a. Draw a graph which models this situation.

• b. How many cookies does the class need to sell to earn 45 cents?

• 3. Think About the Process A dry cleaning company charges \$13 to clean and press 2 jackets.

• a. Draw a graph of the relation.

• b. How can you find the cost to clean and press 4 jackets using a graph?

• A. Locate 4 on the y-axis then move to the right to find the corresponding x-value.

• B. Locate 4 on the x-axis then move down to find the corresponding y-value.

• C. Locate 4 on the x-axis then move up to find the corresponding y-value.

• D. Locate 4 on the y-axis then move to the left to find the corresponding x-value.

• c. Find the cost to clean and press 4 jackets.

• 4. A clothing store has an 45% sales tax on all items purchased.

• a. Draw a graph which models this situation.

• b. Is the amount of taxes proportional to the purchase?

• 5. A salesperson earns a commission that is a percent of the sales. The graph shows the proportional relationship between sales and commission. What percent commission does the salesperson earn?

• 6. A submarine dives at 140 feet per minute. Draw a graph which models this situation. Start when the submarine is at sea level (0 feet).

• 7. A 10-inch candle burns at a rate of 2 inch per hour.

• a. Draw a graph which models this situation.

• b. How long will the candle last?

• 8. Error Analysis A tree grows 15 inches each year. Angela is asked to find when the tree will be 3 , and 3 fourths feet tall. Angela incorrectly says 45 years.

• a. Draw a graph which models the situation.

• b. How many years will it take for the tree to be 3 , and 3 fourths feet tall?

• c. Which mistake might Angela have made?

• A. Angela did not convert the height of the tree correctly.

• B. Angela gave the height of the tree in inches not the number of years.

• C. Angela gave the height of the tree in feet not the number of years.

• D. Angela drew a graph with a negative relationship instead of a positive relationship.

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