Is the function represented by the table linear or nonlinear and why?

x y
2 10
4 9
6 8
8 7

the function is linear because it decreases at a constant rate.

the function is not linear because there is no x value of 0.

the function is linear because all of the values on the table are positive.

the function is not linear because the x values and y values are increasing in opposite directions.