Power point working through 3 levels. Could be broken up into 3 separate files and set up for use in a centers activity. Each level includes a quiz to assess whether or not the student it ready to proceed. If they are not, the student completes the tutorials session before going on. Beginners level ("straight ahead") introduces solving systems by graphing. Intermediate level ("uphill") introduces solving systems by substitution while referring back to the graphing problems. Advanced level ("Mountainous") uses an application problem for systems.