Answer: Linear function.
Explanation:
Let's start by discussing linear and nonlinear. A linear relationship/function means that for every change in x, we have the same change in y. For example, every time x increases by 1, we increase y by 1. A nonlinear relationship does not change equally. When x changes by 1, y might change by 1, then 2, then 3, etc. Not the same every time.
If we look at the table, we see that for every change in x, y increases by 2. Therefore, we have a linear relationship or function.
We can verify this by plotting. A linear relationship is a straight line. When we plot these points, we see a straight line is formed.