What two expressions are equivalent to (-)(2)

Which function has the same domain as y=2x

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)

I’m really confused and need your assist me with this question i’ve never been taught