What is this problem about?
What must the viewer pay special attention to in order to understand?
Please pay special attention to all the steps and remember to solve for things in row-echelon form. Do not forget that y=a and that this system is consistent dependent and not inconsistent because one of the rows gives you 0 0 0 0 and not a false statement like 0 0 0 9. It is also not consistent independent because it is not a certain solution. It has an infinite amount of solution under the constraints of the solution we got.