The base fee for all appointments is $30.
Step-by-step explanation:
Step 1 :
Equation modelling the plumber's total cost = y = 25x + 30,
y = total cost in dollars
x = number of hours of repair.
Given that the plumber charges a base fee for the repair
Step 2 :
From the equation we can see that the co efficient of x is 25. As this component is dependent on x , this is the hourly charge added by the plumber.
So in case he works for 1 hour, the charge would be 25 * 1 = 25 dollars plus the base charge.
The second component in the model equation is 30. This is independent of any variable and indicates that this amount is charged irrespective f the number of hours worked. This is the fixed component.
Hence the base fee for all appointments is $30.
Step 3 :
Answer :
The base fee charged for all appointments is $30.
