You first need to set up an equation where the cost of shoes is a constant ($2.00) and the cost of each game varies per amount of games played ($2.50x). You want your equation to equal $14.50 in total so it would look like this:
2+2.5x=14.5
Now, you have to perform inverse operations to isolate your variable.
First, subtract the 2 (price for shoes) from the total price (14.50)
2.5x=12.5
At this point, all you have left to do is divide the remaining amount ($12.50) by the price per game ($2.50)
12.5/2.5=5
x=5
You can play 5 games at a cost of $2.50 per game with a $2.00 charge for shoes.