In the expression \( 15 + 5x + 2y - 8 \), the coefficients are the numbers that multiply the variables \( x \) and \( y \).
Here, the coefficients are:
- The coefficient of \( x \) is \( 5 \).
- The coefficient of \( y \) is \( 2 \).
So, the coefficients in the expression are \( 5 \) and \( 2 \).