Modeling with Linear Functions · Exercise 47
A phone company has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used for voice and video calling. If a customer uses 410 minutes, the monthly cost will be $71.50. If the customer uses 720 minutes, the monthly cost will be $118.
ⓐ Find a linear equation for the monthly cost of the cell plan as a function of x, the number of monthly minutes used.
ⓑ Interpret the slope and y-intercept of the equation.
ⓒ Use your equation to find the total monthly cost if 687 minutes are used.
OpenStax, Precalculus 2e · §2.3 Modeling with Linear Functions · Exercise 47
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