Digits, Grade 7, Volume 1, Homework Helper

### 8-2: TEKS Practice

• 1. Find the initial value of the linear function y equals 3 x plus 5 .

• 2. What linear function has initial value 2?

• A. y equals 3 x plus 2

• B. y equals minus 2 x en dash 3

• C. y equals minus 3 x en dash 2

• D. y equals 2 x plus 3

• 3. Use the graph to answer the following questions.

• a. Find the rate of change of the linear function.

• b. Find the initial value of the linear function.

• 4. The graph models the height h, in meters, of a hot air balloon, t minutes after beginning to descend. How high was the balloon when it began its descent?

• 5. Writing The linear function in the graph models the temperature T at t hours after noon on an autumn day.

• a. Find the initial value of the function.

• b. What does this initial value represent?

• A. The temperature at ten

• B. The total change in temperature

• C. The temperature at noon

• D. The amount of time that passes

• c. Sketch a graph with an initial value greater than the initial value in this graph.

• d. Describe a situation that your graph could model. What can you conclude about the temperature in your graph?

• 6. Think About the Process The linear function y equals 70 plus , 4 fifths , x models y, the height of an elevator in feet, after x seconds.

• a. Which property lets you rewrite the equation in y equals m x plus b form?

• b. What is the initial value of the function?

• c. What does the initial value represent?

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