The graph of a linear function can be portrayed as a single, straight line in a coordinate plane. To begin determining if the data given in the table represents a linear function, let's first plot the data as (x,y) coordinate pairs.
If the function is linear, connecting these points will form a straight line. Otherwise, we will have shown that the function is nonlinear.
Now that we have connected all of our points, we can see that they do not all lie on the same line in the coordinate plane. Therefore, the function is nonlinear.
