Today's opener will be a short review of solving a system of equations by substitution.
Then we'll use this Activity Builder to start talking about solving systems by elimination. I tried combining (and tweaking slightly) two activity builders that I thought went well together, but I'm a bit worried it might be too much for the roughly 50 minutes I'm hoping to give for it. Your thoughts are appreciated.
Their homework will be a solving systems by elimination problem involving atomic weights. This might be a stretch for them, especially if we they don't have any class time to start on it (and I hope they do). That's partially why I'm not making this one a screencast (the other part of that partial is just to give them a break from making screencasts.)
Update: Changed the homework to Basketball Shots and moved the atomic weights to part of the lesson the next day. Just felt like it was a bit too complicated to give them that quickly.