Respuesta :
To solve a problem such as this we need to assign a variable to each value
Say like the number of tickets sold before the tournament
Number of tickets sold at the tournament door
Hence two variables are needed
Here we can see that the 3 rd option assigns x for the number of tickets sold before the tournament
and the 4 th option applies y for the number of tickets sold at the door
Hence these two options are the right variables for the given situation while the other options are irrelevant to the data given in the question