Students will love "playing basketball" to review Linear Systems of Equations.
This power point Game allows student teams to pick a "2 point basket" problem or a "3 point basket" problem. Of course, the 3 point problem is a little more difficult than the 2 point.
The power point is super easy to use. Each problem slide has a link to the correct answer. The only 3 documents that you may want to print are graph paper that is provided for students to use when solving by graphing, a problem documentation sheet (to keep up with the problems chosen) and a team score sheet.
This would also be a great activity to place in your Emergency Sub Folder as it is very easy for a sub to use.
I've allowed my students to even "shoot baskets" in the class if their team has the correct answer using a nerf basketball, garbage can, etc.