To determine the number of horses the trainer can train based on the treats available, we can use the following equation:
Let \( x \) be the number of training sessions (or horses) that the trainer can accommodate.
Since she needs 5 treats per training session and has a total of 42 treats, we can write the equation:
\[ 5x \leq 42 \]
To find out how many horses (or training sessions) she can train, we can solve for \( x \):
\[ x \leq \frac{42}{5} \] \[ x \leq 8.4 \]
Since the number of horses has to be a whole number, the maximum number of horses she can train is 8.
So, the solution to the problem is \( x = 8 \), which is a viable option because she will use \( 5 \times 8 = 40 \) mints, leaving her with 2 mints, which is still a valid situation as no treats are wasted.
Thus, the equation \( 5x \leq 42 \) correctly models the situation, and \( x = 8 \) is a viable solution.