To find the number of horses that the trainer can train with the treats she has, we can denote the number of horses she can train as \( h \). Since she needs 5 treats per training session, the total number of treats needed for \( h \) horses would be \( 5h \).
Given that she has a total of 42 mints, we can set up the following equation:
\[ 5h \leq 42 \]
Now, to find the maximum number of horses \( h \) she can train, we can divide both sides by 5:
\[ h \leq \frac{42}{5} = 8.4 \]
Since the number of horses must be a whole number, we can conclude that she can train a maximum of 8 horses.
To summarize, the equation that shows the number of horses that she can train is:
\[ 5h \leq 42 \]
The viable solutions for \( h \) are non-negative whole numbers less than or equal to 8, specifically \( h = 0, 1, 2, 3, 4, 5, 6, 7, \) or \( 8 \).