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A straight line you can use

By Maths in the wild · myAudience

Illustrated fictional bicycle-hire cost model: C = 3 + 2n. A table gives costs 3, 5, 7 and 9 units for 0, 1, 2 and 3 hours; five hours costs 13 units. No coordinate graph is shown.

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Imagine a hire fee of 3 units plus 2 units per hour: C = 3 + 2n. At 0, 1, 2 and 3 hours, the costs are 3, 5, 7 and 9. The intercept is the starting charge; the slope is the cost of one more hour. Try n = 5: C = 13. Define units and the range where your model makes sense.

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