Students are selling tickets to a scool fundraiser for every 15 tickets a student sells a student earns a t-shirt as a reward what are the indendent and dependet variable

Y=dependent variable
x=independent variable.

y=number of T-shirt
x=number of tickets.

The function would be:
y=x/15

Therefore:
T-shirt= dependent variable.
tickets=independent variable.

The expression of this would be 3.75x+y= 23

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