Write down the value of $a$ and of $b$.

Explain what the gradient $a$ represents.

Use the model to estimate the amount of fuel the car would use if it is driven $110$ km.

$a = 0.0823604{\text{, }}b = 0.306186$

$a = 0.0824{\text{, }}b = 0.306$     A1A1     N2

[2 marks]

correct explanation with reference to number of litres

required for $1$ km     A1     N1

eg     $a$ represents the (average) amount of fuel (litres) required to drive $1$ km, (average) litres per kilometre, (average) rate of change in fuel used for each km travelled

[1 marks]

valid approach     (M1)

eg     $y = 0.0824(110) + 0.306$, sketch

$9.36583$

$9.37$ (litres)     A1 N2

[2 marks]