Problem 18 of 7
A plumber charges a 75 dollar service fee plus 50 dollars per hour. The total bill is 225 dollars. Write and solve an equation of the form ax + b = c.
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
build ax + b = c, solve, attach units.
Hidden until you reveal it.
Equation must have fixed fee plus rate times variable.
Enter your answer
Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Identify the fixed amount and the repeated rate.
2. Write rate times variable plus fixed amount equals total.
3. Subtract the fixed amount, then divide by the rate.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Equations omitting fixed fee.