Can someone help me with this math problem?

Question

Rajan bought 5 copies of a book to give as gifts. The book was on sale for $5 off the original price. The total that Rajan spent on 5 books was $2 more than he would have spent on 4 copies of the book at the original price. What was the original price of the book? Write an expression

Answer 1

The total that Rajan spent on 5 books was $2 more than he would have spent on 4 copies of the book at the original price

5x - 2 = 4y

x = y - 5

Substitute:

5(y - 5) -2 = 4y

5y - 25 - 2 = 4y

y = 27

x = 22