Set 9: Linear Functions

Explanation

Answer: A

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

$60

✓ Correct

$40

$100

$50

Detailed Explanation

Choice A is correct. Choice A is the correct answer. Find y-intercept. 1. Equation: $y = 40 x + b$ . 2. Substitute: $140= 40(2) + b$ . 3. Solve: $140= 80 + b \rightarrow b = 60$ . Strategic Tip: Total Cost - (Hourly Rate $\times$ Hours) = Flat Fee. Choice B is incorrect. Choice C is incorrect. Choice D is incorrect.

Key Steps:

•

The correct answer is $60

Why others are wrong:

B: Choice B is incorrect and may result from a calculation error.

C: Choice C is incorrect and may result from a calculation error.

D: Choice D is incorrect and may result from a calculation error.

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