To find the number of visits per month where the costs of both plans are equal, we can set up the equations based on the two plans:
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First plan: The cost is $20 per visit, so the total cost for \(x\) visits will be: \[ C_1 = 20x \]
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Second plan: The cost is $45 per month plus $5 per visit, so the total cost for \(x\) visits will be: \[ C_2 = 45 + 5x \]
To find when these two costs are equal, we set the equations equal to each other: \[ 20x = 45 + 5x \]
Thus, the equation you are looking for is: \[ 20x = 45 + 5x \]
This matches none of the exact formats in your responses, but it can be simplified and solved from this point.