A plumber charges a flat fee plus an hourly rate. The graph shows the relationship between the number of hours, , the plumber works and the total cost, , for a service call. If the plumber works 3 hours, the total cost is $110. If the plumber works 5 hours, the total cost is $170. Which equation represents this relationship, and what does the -intercept represent?
; The -intercept represents the hourly rate.
; The -intercept represents the flat fee.
; The -intercept represents the hourly rate.
; The -intercept represents the flat fee.
