4. Brandon is selling lemonade for $3 dollars each and water bottles
for $1.50 dollars each. He started the day with $3.25 in the cash
register and ended the day with $22.75 in the register.
Write an equation below that represents the relationship between the
amount of money in the register at the end of the day and the
number of lemonades sold, L, and water bottles sold, W.