AlgebraHardStarting value from two readings
Algebra practice question
A taxi meter shows $20 after 3 kilometres and $35 after 6 kilometres, and the fare is a linear function of distance. What did the meter show, in dollars, at the start of the ride?
Answer: 5
The rate is 15/3 = 5 dollars per km, so the start was 20 − 15 = 5.
Common wrong answers
- If you answered 0
- 0 assumes no starting charge.
- If you answered 10
- 10 subtracts one rate step only.
- If you answered 15
- 15 is the rise between the readings.
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