To find the number of visits per month at which the costs of the two plans are equal, we can set up the following equations based on the plans:
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For the first plan (cost per visit): \[ \text{Cost}_1 = 8x \] where \( x \) is the number of visits.
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For the second plan (monthly cost plus cost per visit): \[ \text{Cost}_2 = 40 + 2x \]
To find the number of visits \( x \) where both costs are equal, we set the equations equal to each other: \[ 8x = 40 + 2x \]
This is the equation that shows the number of visits per month where the two plans cost the same.