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The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes).

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The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after 45 minutes of calls is $23.25, and the remaining credit after 72 minutes of calls is $19.20. What is the remaining credit after 79 minutes of calls? Remaining credit (in dollars) Calling time (in minutes) $0 5 ?

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