Taxi Charge = 1.75 + 0.75*Mile traveled.
Let mile traveled be = m
Taxi Charge = 1.75 + 0.75m
So for a taxi charge of 4.75
4.75 = 1.75 + 0.75m
1.75 + 0.75m = 4.75
0.75m = 4.75 - 0.75
0.75m = 4
m = 4/0.75
m = 5.333
Number of miles traveled = 5.33 miles.