The following model can be used to experiment with addition in a variety of elliptic curve groups.
Try the following experiments:
1. Change the variables a and b to see the resulting shape and the elliptic curve.
2. Select a point P on the curve, and then select a point Q on the curve. Add them together.
3. Select a point P on the curve and then double it.
4. Try selecting a = -3 and b = 2