This activity is designed as a differentiated review tool for systems of equations. I give this after I have assessed my students and know their ability levels with systems. There are 4 different levels of difficulty. You could give to students individually or have them work in groups. Each problem has the students work the same systems problem by graphing and then either by the elimination (addition) method or by the substitution method. Each problem also asks the students to explain their work, decide which method was easier, etc. I have included the answer key to this activity as well.