The true statement is that your friend's claim is correct
The question is an illustration of a linear function; a linear function is a function that has a constant rate/slope
A linear function is represented as:
[tex]y=mx+c[/tex]
The costs are given as:
So, the cost of one admission and one skate rental is:
[tex]Cost = x + \frac y2[/tex]
Hence, your friend's claim is correct
Read more about linear functions at:
https://brainly.com/question/14323743