To find how much is left on the loan after 9 years using the equation \( Y = 15,413 - 1,635x \), where \( x \) is the number of years:
- Plug in \( x = 9 \) into the equation:
\[ Y = 15,413 - 1,635(9) \]
- First, calculate \( 1,635 \times 9 \):
\[ 1,635 \times 9 = 14,715 \]
- Now substitute that back into the equation:
\[ Y = 15,413 - 14,715 \]
- Finally, calculate \( Y \):
\[ Y = 698 \]
Thus, after 9 years, there is $698 left on the loan.