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Te Arapiki Ako
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# 2. “Taxi fare” - understanding relation

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Last updated 26 October 2012 15:30 by NZTecAdmin

The approach suggested in this unit involves starting with a relation. A relation is like a mapping between one set of values to another to a one-to-one way.

For example, you might have a set of taxi fares like this:

Distance (kms)

Fare (\$)

3 5.40
25 23.00
7 8.60
15 15.00

The pairs (3,6.40), (25, 23.00), (7,8.60) and (15,15.00) are a relation.

Suppose you want to find out how the taxi driver calculates their fares then you want to know the rule that connects the first and second numbers in each pair. This approach is a lot more fun than being told the rule is f = 0.8d + 3 and given a few examples to calculate.

Along the way, learners have to apply their number sense in trying out rules that might work.

15 May 2017 19:05
I took me almost 2 hours to got this fare formula; it appears taxi drivers are much smarter than I thought. I was never good at math though, I am a writer who is mostly busy with "overviewing writing services" kind of stuff, for example, WritemyPaper.net reviews on http://essayguard.com/services/writemypaper . I was aware that fare was in relation to distance, but I could not imagine that it was so hard to calculate.
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