To find the number of students on each bus, we can start by calculating how many students were actually transported by the buses.
Since 8 students had to travel in cars, we can find the number of students that were on the buses by subtracting these 8 students from the total number of students:
\[ 449 - 8 = 441 \]
Now that we know 441 students were on the buses, we can divide that by the number of buses (which is 9) to find the number of students per bus:
\[ \frac{441}{9} = 49 \]
Thus, the number of students on each bus is:
\[ x = 49 \]
So, the answer is: \[ x = 49 \text{ students} \]