This question is under the Matrices topic.
I tried solving using Row Reduction and found that if a=-2, the equations are undefined.
Actually I don't know what the question is asking about
Do you know how to solve systems of linear equations using Gaussian elimination? Do you understand the three types of solutions that are possible (unique, infinite, none)? These are the things you will have to review in your class notes and textbook if you are to understand how to do this question.
By the way, I do know about Gaussian Elimination, the three types of solutions(infinite- 0=0, unique-number of equations=unknowns and none-Inconsistent).
Besides, I do know Gauss-Jordan method, Augmented matrix, Eigenvalues and Eigenvectors.