This is a fun, creative way to have students show mastery of solving linear systems. They use the pieces to solve the puzzle and then get to complete a picture when they have solved it. It gives them very quick feedback about how they did (if the pieces don't match, they missed it!) and it's easy to grade. It does take some prep work (mostly cutting) but the class sets, once made, can be laminated and can last a long while.
Prep Time - 4 hours w/cutting (I had my students do this)
Class time - 2 44-minute periods, 1 90-minute period