Cool Air Plus charges a $25 service fee for coming out to the house. They also charge $25 per hour of work that they perform. • Cool Breeze Air charges a $40 service fee for coming out to the house. They also charge $15 per hour of work that they perform. The system of linear equations shown can be used to represent this situation. In the system of linear equations, h represents the amount of time (in hours) it takes the company to perform the work and c represents the total cost (in dollars) of the air conditioning work performed by the company. {25h+25=c15h+40=c