algebra
posted by Please help on .
The equation C=mx+b can be used to model the monthly cost, C, of a cell phone plan where b is the flat monthly cost, m represents the cost in dollars per minute and x is the number of minutes used in the month. Choose a flat monthly rate and cost per minute and insert the values you have chosen for m and b into the equation. Then use this equation to find the total monthly cost, C, if 73 minutes are used.

C=.25(73)+B
C=18.25+80.00
C=$98.25 Monthly
The monthly cell phone costs are $98.25.
Is this what you wanted or something else? 
Not what I wanted, but it fulfills the requirements of the problem.