To find the number of visits per month at which the two plans would cost the same, we can set up an equation based on the total cost for each plan.
- First Plan (Pay per Visit): The cost for this plan is \( 8x \), where \( x \) is the number of visits.
- Second Plan (Monthly Fee + Pay per Visit): The cost for this plan is \( 40 + 2x \).
We want to set these two costs equal to each other:
\[ 8x = 40 + 2x \]
This equation represents the number of visits \( x \) at which the costs of the two plans are the same.