SOLUTION: Hi A phone company charges 35c for the first minute of a call and 15c for each additional minute of the call. What is the cost y of a phone call lasting x minutes. Thanks

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Question 1191116: Hi
A phone company charges 35c for the first minute of a call and 15c for each additional minute of the call. What is the cost y of a phone call lasting x minutes.
Thanks

Answer by Theo(13342) About Me  (Show Source):
You can put this solution on YOUR website!
the function would be y = .20 + .15 * x

the value of x is determined by the duration of the call.

if the call lasts less than or equal to 1 minute, then x = 1 and the formula becomes y = .20 + .15 * 1 = .35

if the call lasts more than 1 minute and less than or equal to 2 minutes, then x = 2 and y = .20 + .15 * 2 = .50

if the call lasts more than 2 minutes and less than or equal to 3 minutes, then x = 3 and y = .20 + .15 * 3 = .65

if the call lasts more than 3 minutes and less than or equal to 4 minutes, then x = 4 and y = .20 + .15 * 4 = .80.

if the call lasts more than 4 minutes but less than or equal to 5 minutes, than x = 5 and y = .35 + .15 * 4.= = .95

the function can be graphed.

it looks like this.