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The credit remaining on a phone card in dollars

The credit remaining on a phone card in dollars is a linear function of the total time in minutes. When graphed, the function gives a line with a slope of -0.13.

There is a credit or $24.94 remaining on the card after 38 minutes. How much credit will there be after 47 minutes.

Can you show the work on how to solve this problem so I can understand how you arrived at the solution?

$2.19