a) Write down the augmented matrix of the system.

b) Use elementary row operations to find a and b (or a relation for a and b),

such that the given system is always consistent.

c) If we write the given system in the form Ax = b, give the matrices A, x,

and b, and determine whether we can have the solution of the system through the

form \(\bf {x}=A-¹b.