10
algebra

Using the plumber data (Rate $40, 2 hrs $140), what is the flat fee?

A

$60

B

$40

C

$100

D

$50

Correct Answer: A

Choice A is the correct answer. Find y-intercept.

  1. Equation: y=40x+by = 40x + b.
  2. Substitute: 140=40(2)+b140 = 40(2) + b.
  3. Solve: 140=80+b→b=60140 = 80 + b \rightarrow b = 60.

💡 Strategic Tip: Total Cost - (Hourly Rate ×\times Hours) = Flat Fee.

Choice B is incorrect.Choice C is incorrect.Choice D is incorrect.

Back to Set
Linear Functions Set 97