The taxi fare in a city is $3 and then $0.40 for every kilometre travelled.

A taxi fare is $9.

How far has the taxi travelled?

(I have the answer but dont know how to work it out)

Question

The taxi fare in a city is $3 and then $0.40 for every kilometre travelled.

A taxi fare is $9. 
 
How far has the taxi travelled?

(I have the answer but dont know how to work it out)

anonymous · Answer

ok
first you need to site up the Q mathematically
3+0.4*D   where D is the distance travelled  [ km]

anonymous · Answer

D=x, since x more common
3+0.4x=9
solving for x
0.4x=9-3
x=6/.4=15 km

anonymous · Answer

I hope that makes it clear for you.

anonymous · Answer

why do we equate 3+0.4x = 9?

anonymous · Answer

okay.... the fare is 3$ up front..... it has nothing to do with distance

anonymous · Answer

and 0.4 is the rate per km ...

anonymous · Answer

so adding these together should give the total charge

anonymous · Answer

ohh okay