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**Question**

15) A company uses this formula to work out the cost, £

*A*, of a taxi ride.

*A*= 4 + 1.8*m*+*b*

a) Clare books a taxi online and travels 8 miles.

She pays £20 altogether.

How much is the charge for booking online?

- £4 is a fixed charge
*m*is the number of miles travelled- £
*b*is a charge for booking online 15

a) Clare books a taxi online and travels 8 miles.

She pays £20 altogether.

How much is the charge for booking online?

**[3 marks]**

15 b) A different company

- has a fixed charge of £3
- charges £1.90 per mile
- has no charge for booking online.

Write a formula for the cost, £

*C*, of a taxi ride with this company.

**[1 mark]**