3
Answer: DSet 9: Linear Equations
Explanation
A rental car costs $50plus \0.20 per mile. Which equation represents the cost $$Cm$ miles?
A.
C = 50m - 0.20
B.
C = 0.20m - 50
C.
C = 50m + 0.20
D.✓ Correct
C = 0.20m + 50
Detailed Explanation
Choice D is correct. Choice A is the correct answer. 1. Fixed Cost: 50 (Intercept). 2. Variable Cost: 0.20 per mile (Slope). 3. Equation: . Choice C is incorrect because swaps slope and intercept. Choice D is incorrect because sign error. Choice C is incorrect because swaps and sign error.
Key Steps:
•
The correct answer is C = 0.20m + 50
Why others are wrong:
A: Choice A is incorrect and may result from a calculation error.
B: Choice B is incorrect and may result from a calculation error.
C: Choice C is incorrect and may result from a calculation error.
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