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Chiomatn93
 2 years ago
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 after33 minutes of calls is $20.05 , and the remaining credit after 67 minutes of calls is $14.95 . What is the remaining credit after 76 minutes of calls?
Chiomatn93
 2 years ago
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 after33 minutes of calls is $20.05 , and the remaining credit after 67 minutes of calls is $14.95 . What is the remaining credit after 76 minutes of calls?

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alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.0hmm so lets make x=# of minutes and y= remaining credit so we would get points (33,20.05) and (67,14.95) now lets find slope dw:1336882216929:dw

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.0now put slope and one of the points into point slope formula dw:1336882289521:dw

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1336882305193:dw

Chiomatn93
 2 years ago
Best ResponseYou've already chosen the best response.0ok so whats the answeR?

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.0now the question is asking for the remaining balance after 76 minutes so sub in 76 for x to find y dw:1336882417666:dw

alexwee123
 2 years ago
Best ResponseYou've already chosen the best response.0if you have any questions feel free :/
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