Most of the time we will probably spot curvature by looking at a graph where both axes are linear and then noticing that what is plotted–linear it is not.
But sometimes we could have a graph where one axis nonlinear and on the graph we see a straight line. This happens on the left in the picture. The y-axis is linear and the function is linear and then…
…we look at the x-axis and see that it is SO NOT linear!
Vectoreverything 