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Calling Card : Credit Left

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The credit remaining on a phone card in dollars is a linear function of the total call time in minutes. The function gives a line with a slope of -0.15.

There is $25.55 in credit remaining on the card after 37 minutes of use. How much credit was there after 28 minutes of calls.

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A word problem is solved using a linear equation. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.

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