When writing the inequatlity for the following situation, what value will be the coefficient? Isabella is going roller skating. To rent

When writing the inequatlity for the following situation, what value will be the coefficient?
Isabella is going roller skating. To rent skates, there is a $3 fee. For every hour she wants to skate, it costs $1.25. Isabella does
not want to spend more than $12. Write an inequality to determine how many hours Isabella can skate.