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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 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?
 one year ago
 one year 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?
 one year ago
 one year ago

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alexwee123Best ResponseYou've already chosen the best response.0
hmm 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
 one year ago

alexwee123Best ResponseYou've already chosen the best response.0
now put slope and one of the points into point slope formula dw:1336882289521:dw
 one year ago

alexwee123Best ResponseYou've already chosen the best response.0
dw:1336882305193:dw
 one year ago

Chiomatn93Best ResponseYou've already chosen the best response.0
ok so whats the answeR?
 one year ago

alexwee123Best ResponseYou've already chosen the best response.0
now the question is asking for the remaining balance after 76 minutes so sub in 76 for x to find y dw:1336882417666:dw
 one year ago

alexwee123Best ResponseYou've already chosen the best response.0
if you have any questions feel free :/
 one year ago
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