I would like to verify that this word problem was translated into a function correctly.
A towing company charges a flat rate of $100.97$ dollars per day plus $0.81$ dollars per mile.
I think the function can be represented as follows if $y$ is cost and $x$ is miles: $$ y=100.97+(0.81)x $$
The average rate of change in dollars per mile is $0.81$. Is this right?