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1.3.1: Creating and Graphing Linear Equations in Two Variables

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1.3.1: Creating and Graphing Linear Equations in Two Variables

A cell phone company charges a $20 flat fee plus $0.05 for every minute used for calls.

1. Make a table of values from 0 to 60 minutes in 10-minute intervals that represent the total amount charged.

2. Write an algebraic equation that could be used to represent the situation.

3. What do the unknown values in your equation represent?

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1. Make a table of values from 0 to 60 minutes in 10-minute intervals that represent the total amount charged.

1.3.1: Creating and Graphing Linear Equations in Two Variables

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Minutes used Total amount charged ($)

0 20 + 0(0.05) = 20.00

10 20 + 10(0.05) = 20.50

20 20 + 20(0.05) = 21.00

30 20 + 30(0.05) = 21.50

40 20 + 40(0.05) = 22.00

50 20 + 50(0.05) = 22.50

60 20 + 60(0.05) = 23.00

2. Write an algebraic equation that could be used to represent the situation.• y = 0.05x + 20

3. What do the unknown values in your equation represent?• x represents the number of minutes used, and y

represents the total amount charged.

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1.3.1: Creating and Graphing Linear Equations in Two Variables