# Calculate remaining minutes on phone card.

1. The credit remaining on a phone card(in dollars)is a linear function

of the total calling time (in minutes). When graphed, the function

gives a line with a slope of -0.15. There is 29.35 in credit remaining

on the card after 29 minutes of calls. How much credit will there be

after 41 minutes of calls?

2. Write an equation of the line with points(-6,2) and (-1,1).

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#### Solution Preview

1. The credit remaining on a phone card(in dollars)is a linear function

of the total calling time (in minutes). When graphed, the function

gives a line with a slope of -0.15. There is 29.35 in credit remaining

on the card after 29 minutes of calls. How much credit will there be

after 41 minutes of calls?

Let y is the credit remaining on ...

#### Solution Summary

The expert calculates minutes on phone card. The equation of the line with points are written.