A system has been packed into the matrix equation Ax=bA\mathbf{x} = \mathbf{b}Ax=b, where
A=[1234],b=[818],x=[xy]A = \begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix}, \qquad \mathbf{b} = \begin{bmatrix} 8 \\ 18 \end{bmatrix}, \qquad \mathbf{x} = \begin{bmatrix} x \\ y \end{bmatrix}A=[1324],b=[818],x=[xy]
Which vector x\mathbf{x}x satisfies Ax=bA\mathbf{x} = \mathbf{b}Ax=b?
Select all that apply.
(3, 2)(3,\; 2)(3,2)
(2, 3)(2,\; 3)(2,3)
(11, −1)(11,\; -1)(11,−1)
(4, 2)(4,\; 2)(4,2)