As you can see from the table, Free time (y-axis) decreases as you increase number of sports teams (x=axis).
Is the relationship a function that is increasing or decreasing?
As x increases, y decreases.
Hence, it is a decreasing function (line).
Is the relationship a function that is linear or nonlinear?
The y values decreases by 7.

So this is a linear relationship.
ANSWER: C