Zurich

Distance travelled (km) vs Cost (US $)
0 km - 12 $
2 km - 14 $
4 km - 16 $

Tokyo

Distance travelled (km) Cost (US $)
0 km - 15$
2 km - 16$
4 km - 17$

Chengdu

Distance travelled (km) Cost (US $)
0 km - 11.20$
2 km - 13.00$
4 km - 14.80$

The relationship between cost and distance can be modelled in a different way by means of an equation.
Here is the equation for Zurich, where x is distance (km) and y is cost (US$).
y=x+12
DETERMINE the equations for Tokyo and Chengdu (ii), (iii)

Tokyo (Show Working):

Chengdu (Show Working):

DETERMINE when it becomes more expensive to ride a taxi in Chengdu than Tokyo. At what cost does the situation change?