Final answer:
The expression 9r - 2s - 4r - 3s simplifies to 5r - 5s.
Step-by-step explanation:
To simplify the expression 9r - 2s - 4r - 3s, we can combine like terms by adding the coefficients of r and s respectively.
Combining the r terms, we have 9r - 4r = 5r.
Combining the s terms, we have -2s - 3s = -5s.
So the simplified expression is 5r - 5s.