Question

the taxi fare in a city is as follows: For the first kilometre the fare is Rs.10 and for the subsequent distance covered and Rs.4 per km. taking c km. as the distance covered and Rs. y as the total fare. write a linear equation for this information and draw its graph

Answer 1

You can find the similar question in your NCERT book of Chapter 4 class 9 
But anyway here is your answer 
Let the total distance = C
For first Kilometer = Rs.10
After giving Rs.10, C-1 distance is left to cover
There is Rs.4 for each C-1
Total fare to travel C-1km = 4(C-1)
Total fare to travel C km = 10+4(C-1)
y= 10-4+4c
y = 6+4c
This is your equation