[MadVikingGod]

In a traditional tree you just store a bunch of y's. So let's say 7 points are just y0-y6. In a tree you would need at least 7 keys stored. In this you would just have m and b stored and you would use the formula to look up the index.

[eloff]

Thanks, that really helps get an intuition for how this works! It's pretty clever really.