(a) Suppose that the augmented matrix for a system of equations reduces to
row1 1 0 0 0 -1
row2 0 1 0 0 2
row3 0 0 1 0 0
row4 0 0 0 1 -4
:
Write the solution if the variables are x; y; z and w, respectively.
(b)What is the solution to the system in (a) if the second row is replaced by
0 0 0 0 1 ?
(c) What is the solution to the system in (a) if the second row is replaced by
0 0 0 0 0 ?