The manager of an apartment building needs an electrician to repair the power generator for the building. The table below shows the fixed amount for a time service call and hourly charges for two different companies.

Company B’s total cost, ,y is the fixed amount for a service call plus the hourly rates. If the relationship between Company B’s total cost, ,y and the number of hours, x, is graphed in the xy-plane, what does the slope of the line represent?

A) Fixed amount for a service call

B) Hourly Rate

C) Total amount for one day

D) Total amount for repairing the power generator

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Company A B Fixed amount for a service call $40 $75 Hourly Rate $55 $48