Answer:
The algebraic expression is
where x is the number of games they bought and y be the total cost.
Explanation:
Consider the provided information.
The cost price of computer is 499.00
Let x is the number of games they bought and y be the total cost (before sales tax).
The cost of each game is 49.99. If they bought x games, then the total cost will be:

Therefore, the algebraic expression is
where x is the number of games they bought and y be the total cost.