SOLUTION: Two mechanics worked on a car. The first mechanic charged $85 per hour, and the second mechanic charged $80 per hour. The mechanics worked for a combined total of 25 hours, and tog

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Two mechanics worked on a car. The first mechanic charged $85 per hour, and the second mechanic charged $80 per hour. The mechanics worked for a combined total of 25 hours, and tog      Log On


   

Question 934113: Two mechanics worked on a car. The first mechanic charged $85 per hour, and the second mechanic charged $80 per hour. The mechanics worked for a combined total of 25 hours, and together they charged a total of $2100. How long did each mechanic work?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
x hours done at 85 per hour, y hours done at 80 per hour.

system%2880x%2B85y=2100%2Cx%2By=25%29

Divide members of the money equation by 5:

system%288x%2B9y=420%2Cx%2By=25%29;
Better now?
Solve the system; Elimination Method may be a good way to start.