This file is a bundle of 42 multiple-choice questions that can be used with the Plickers app. The first 11 questions cover only substitution. The next 11 cover only elimination. The next ten cover only word problems. The final ten questions include a variety of substitution, elimination, and word problems. All sets come with various levels of difficulty. If you have never heard of Plickers, click on the link below for a description. It is unbelievable how engaged students are with this trick! You can also incorporate these questions into your own games.