Which explains whether or not the function represents a direct variation?
A
This function represents a direct variation because it passes through the origin and has a constant rate of change of 5 dollars per hour.B
This function does not represent a direct variation because it does not represent the cost for 1 hour.C
This function does not represent a direct variation because the function rule for the cost is to add 10 dollars , not multiply by a constant.D
This function represents a direct variation because it has a positive, constant rate of change of 10 dollars per hour.