To find out how many students were on each bus, let's set up the equation based on the information provided.
Let \( x \) be the number of students on each bus.
Since there are 9 buses and 8 students had to travel in cars, the total number of students that can fit in the buses can be represented as:
\[ 9x + 8 = 449 \]
Now, to solve for \( x \), we can first subtract 8 from both sides of the equation:
\[ 9x = 449 - 8 \] \[ 9x = 441 \]
Next, divide both sides by 9:
\[ x = \frac{441}{9} \] \[ x = 49 \]
Thus, the number of students on each bus is:
\[ \boxed{49} \]