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

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