Some Systems of Equations Examples

I thought I'd take a minute and share a few examples of things I tried with my Algebra students when learning Systems of Equations. All of these have some kind of technology component, although often it's a small part of the lesson and there is still plenty of paper-and-pencil practice that can be integrated in.

On the Road Again (again)
This is what I used to introduce Systems. Note that we had already done this problem once when learning how to graph, I just extended it to talk more explicitly about Systems of Equations. Uses Google Drive and Desmos.

Basketball Shots
Used these videos/screenshots. Look at page 5 and 6 of this lesson for a bit more context. Uses video, screenshot and Desmos.

Dueling Toilets
Look at page 7 of this lesson and this saved Desmos graph to get an idea of what we did. Uses screenshot and Desmos.

iPhone Rate Problem
Uses Google Drive as an electronic worksheet and Desmos (Voice, Text, Data), but mostly non-technology.

Atomic Weights
Uses Google Drive as an electronic worksheet, but mostly non-technology.

Which Method Makes Sense
Uses Google Drive as an electronic worksheet, but mostly non-technology.

Error Analysis and Multiple Representations
Uses Google Drive as an electronic worksheet, but mostly non-technology.

Stacking Cups Blog Post
Uses Google Drive and Blogger.

A Typical Envelope
Systems of Inequalities. Uses Google Drive and Desmos (graph by hand, then compare to Desmos).

Half Your Age Plus 7
Systems of Inequalities: Uses Google Drive and could use Desmos.

Again, these each have a technology component, but only some of them really depend on the technology. Are there any of these you think you might be able to use? Or do you have suggestions for how to extend them?