7.4a Classwork (1)

Last updated over 5 years ago
9 questions
1 Activity: Writing an Equation in Two Variables
You earn $8 per hour working part-time at a store.
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a. Complete the table.

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b. Use the values from the table to complete the graph. Then answer each question below and on the next page. Ask yourself:
· What does the horizontal axis represent? What variable did you use to identify it?
· What does the vertical axis represent? What variable did you use to identify it?
· How are the ordered pairs in the graph related to the values in the table?
· How are the horizontal and vertical distances shown on the graph related to the values in the table?

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c. How can you write an equation that shows how the two variables are related?

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d. What does the line in the graph represent?

2 Activity: Describing Variables
Use the equation you wrote in Activity 1 part c
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a. How is this equation different from the equations earlier in this chapter?

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b. One of the variables in this equation depends on the other variable. Determine which variable is which by answering the following questions:

· Does the amount of money you earn depend on the number of hours you work?
· Does the amount of money you earn depend on the number of hours you work?

How do you think you can use these types of variables in real life?

3 activity: Describing a Formula in Two Variables
Recall that the perimeter of a square is 4 times its side length.
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a. Write the formula for the perimeter of a square. Tell what each variable represents.

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b. Describe how the perimeter of a square changes as its side length increases by 1 unit. Use a table and a graph to support your answer.

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c. In your formula, which variable depends on which?