OpenStax, Algebra and Trigonometry 2e §2.3 Models and Applications · Example 3 · Algebra · Inequalities

Setting Up a Linear Equation to Solve a Real-World Application

There are two cell phone companies that offer different packages. Company A charges a monthly service fee of $34 plus $.05/min talk-time. Company B charges a monthly service fee of $40 plus $.04/min talk-time.

ⓐWrite a linear equation that models the packages offered by both companies.
ⓑ If the average number of minutes used each month is 1,160, which company offers the better plan?
ⓒIf the average number of minutes used each month is 420, which company offers the better plan?
ⓓHow many minutes of talk-time would yield equal monthly statements from both companies?

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OpenStax, Algebra and Trigonometry 2e · §2.3 Models and Applications · Example 3

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