Question

(TAKE A PICTURE)
Of the answers to the attached photo's question.

Answer 1

Looking at each x and y in the graph, you can tell the graph is nonlinear.
If you plotted it, you would get a parabola.
In a linear function, the change in the variables would be constant.
For example, (-1, 5), (0, 3), (1, 1), etc.