Practical The matrix below is in its reduced row echelon form, and it corresponds to a linear system of equations in variables 21, 22, 23, 24 and 25. (The first column of the matrix corresponds to x, the second to 1, etc.) 1 2 0 0. 8 6 0 0 10-1 0 0001 1 Identify the leading and the free variables, and write down the general solution to the system. Answer: