Solution: ripping off Fawn Nguyen and Dan Meyer (Week 10).
You know the drill: find the missing things.
I actually liked my second version of this activity a bit more. I gave them a bunch of patterns and equations and had them match them up on the whiteboards.
This significantly lowered the barrier to entry, and I had some good conversations with some struggling Algebraists.
(A close eye will notice that in this second activity not all the patterns match up with equations, and not all the equations match up with the graphs. This was a good idea, because it was a nice twist, required some creativity in the pattern making, asked kids to review linear modeling, and took away some of the pigeonholing that often annoys me about matching activities.)
Here lie the files, in case you want 'em:
Extensions and spin-offs in the comments, if you please.