Modeling with Linear Functions · Exercise 51
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 or 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, Algebra and Trigonometry 2e · §4.2 Modeling with Linear Functions · Exercise 51
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