Compute the rank and nullity of the matrix A and state what this implies about the existence and/or uniqueness of solutions x of Ax=b.

A = [1 1 3]

1 2 3

3 2 1

Sol: Reduced row echelon form = [1 0 -1]

0 1 2

0 0 0

Therefore, Rank(A)=2, and Nullity (A) = 1. But I don't get the second part though. Does it mean there's only one solution?