Tangent Line Versus Secant Line
- Use the drop down menu to select a function.
- The blue line is a secant to the function through points A and B.
- The green line is a tangent to the function through point A.
- Drag points A and B to see how the slopes of the tangent and secant lines change.
- Drag point B closer to point A and see what happens to the slopes of the secant and tangent lines as B approaches A.