This is an introductory activity showing how the straight line gradient tends towards the gradient of the tangent at small approximations. This illustration will serve as a visual before using First Principles to derive gradient of a curve.
Gradient of 2 points A and B can be observed on the [color=#c51414]red line[/color] shown. Tangent of a point A can be observed on the [color=#1551b5]blue line[/color] shown. What happens to the gradients of the lines when you drag the point B closer towards A?