Nana's Paint Mix Up Part 2

Author:
Shaun
This applet is based on Dan Meyer's lesson "Nana's Paint Mix Up." Watch the video here: https://vimeo.com/87211369 and "fix" the mix up. Then play with the graph below. Toggle the slider to get a sense of how we can graph the color mixture.
How does toggling the slider change line? How does it change the graph? Can you infer what color is represented by each axis? How do the points connect the idea of mixing red and white paint? Do you think we should connect the points on this graph?