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Caling Card : Remaining Credit

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Credit remains on a phone card in dollars is a linear function of a total calling time made with the card in minutes.

The remaining credit after 26 minutes of calls is $26.10 and the remaining credit after 53 minutes of calls is $22.05. What is the remaining credit after 77 minutes of calls?

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I am stuck on this problem. I think the slope is 0.14 but I can not get the equation to work out. The equation I am trying to use is C=mt+b but it does not seem to work out correctly. Please assist by showing how you arrive at the ...

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