To represent the situation where Santiago bought a total of 34 books, we can define two variables:
- Let \( b \) represent the number of board books.
- Let \( s \) represent the number of soft cover books.
Since Santiago bought a total of 34 books, we can write the equation for the sum of board books and soft cover books as follows:
\[ b + s = 34 \]
This is the second equation representing the total number of books Santiago bought. If you have a specific context or additional information (like a relation between board books and soft cover books), we can create a second equation as needed.