The Matrix Algebra Tutor: Learning by Example DVD Series teaches students about matrices and explains why they're useful in mathematics. This episode teaches students about inconsistent and dependent systems in matrix math. Sometimes, a system of equations does not have a well-defined solution. For example, if we have two equations that represent two lines and these lines are exactly parallel and never intersect, then these equations do not have a solution. In this program, these ideas are explored. Grades 9-College. 54 minutes on DVD.