1. The problem statement, all variables and given/known data (i) Reduce the system to echelon form C|d (ii) For k = -12, what are the ranks of C and C|d? Find the solution in vector form if the system is consistent. (iii) Repeat part (b) above for k = −18 2. Relevant equations Gaussian elimination I used here: http://mathworld.wolfram.com/GaussianElimination.html 3. The attempt at a solution I've attempted reducing the matrix but have run into this problem where I have two zeroes leading in the last three rows. I don't know what I am doing wrong, so any help would be greatly appreciated. I can't continue with either parts b or c without solving part a, and I'm not too sure about those parts either.