A driver hires an auto rickshaw .The fare is Rs 20 for first km and Rs 9 for subsequent
distance. Taking total distance covered is x km and total fare is Rs y.
a) Write a linear equation for the above situation
b) A man covers a distance of 15 km and gave Rs 150 to the driver.
Driver said ‘it is not the correct amount’ and returned him the balance.
Find the correct amount paid back by the driver.