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A cellular phone company offers several different services plans. One option, for people who plan on using the phone only in emergencies, costs the user $5.05 per month plus $0.60 per minute for each minute the phone is used. 
 

a. Write a linear function for the monthly cost of the phone in terms of a number of minutes the phone is used. 
b. Use your equation to find the cost of using the cellular phone for 18 minutes in 1 month. 

 May 5, 2020
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a. Where y is the monthly cost and x is the number of minutes the phone is used, the linear equation is y=5.05+0.6x.
b. Plugging in 18 in the place of x, we can solve for y: y=5.05+0.6(18)=15.85. The answer is $15.85.

 May 5, 2020

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