Consider the system Ax=bAx = bAx=b where A=(1224)A = \begin{pmatrix} 1 & 2 \\ 2 & 4 \end{pmatrix}A=(1224). Which statement best describes the solutions?
Unique solution exists.
No solution exists.
Infinitely many solutions or no solution depending on bbb.
The matrix AAA is invertible.