Generate and plot ordered pairs from rules, tables, and contexts.
Make coordinates from a context
Problem
A rental bike costs \(\$3~\text{per}~\text{hour}\). Calculate the total cost for \(1,~2,~4,~\text{and}~6~\text{hours}\), then report the complete ordered-pair list in the form \((\text{hours},~\text{total}~\text{cost})\).
Big Picture
What this problem is really about
The hourly charge is a rate, so multiply it by each requested duration to find a total rather than adding it once or treating it as a fixed total. Keep the context attached to the coordinates: hours belong first and their calculated total cost belongs second. Repeating that process for every duration produces a complete, consistently ordered list.
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