Final answer:
The two options for Keith's number of visits and total cost can be represented by two equations: one for the membership card option and one for the pay per visit option.
Step-by-step explanation:
The two options for Keith's number of visits and total cost can be represented by the following equations:
Option 1: Number of visits (V) = x
Total cost (C) = $20 (membership) + $2x (visits)
Option 2: Number of visits (V) = y
Total cost (C) = $5y (visits)
Where x and y represent the number of visits for each option, and V represents the number of visits and C represents the total cost.