Two friends are going on a vacation. The hotel room they are staying in is ​$140 per night. The total cost for both tickets to the theme park they are going to is ​$65. Write an equation for how much money the friends will spend on the​ vacation, where y is the total cost of the vacation and x is the total number of nights. How many nights are the friends going on vacation if they plan on spending ​$625​? Use pencil and paper. Draw algebra tiles to solve for the number of nights that the friends are on vacation for.