URGENT!!! PLEASE HELP IM ON THE LAST QUESTION IN IXL AND DONT WANT TO GET IT WRONG

The table shows a function. Is the function linear or nonlinear?
x y
0 19
18 1
20 0

i WILL give brainliest!!!

URGENT PLEASE HELP IM ON THE LAST QUESTION IN IXL AND DONT WANT TO GET IT WRONG The table shows a function Is the function linear or nonlinear x y 0 19 18 1 20 class=