# Parabola Plotter

- Author:
- perspect

- Topic:
- Parabola

Here is the parabola plotter. Try to drag the bar to change a, b and c independently to see the change of parabola. Remember the change of it!

1. What is the locus of the vertex when a, c are fixed and b change?
2. Why is the graph a straight line when a= 0? (and why there is no vertex?)
3. How is the graph looks like when a>0, b<0 and c<0?