If A = $\begin{bmatrix} 3 & -6 \end{bmatrix}$ and B = $\begin{bmatrix} 3 & -1 \ 4 & 3 \end{bmatrix}$, then the order of matrix AB is:

1. 1 × 2

2. 2 × 1

3. 2 × 2

4. 1 × 3

If $\begin{bmatrix} 2 & 0 \ 0 & 4 \end{bmatrix}\begin{bmatrix} x \ y \end{bmatrix}$ = $\begin{bmatrix} 2 \ -8 \end{bmatrix}$, the values of x and y respectively are:

1. 1, -2

2. -2, 1

3. 1, 2

4. -2, -1

If matrix A = $\begin{bmatrix$}[r] -1 & 2 \end{bmatrix} and matrix B = $\begin{bmatrix$}[r] 3 \ 4 \end{bmatrix}, then matrix AB is equal to:

$1. \begin{bmatrix$}[r] -3 \end{bmatrix}

$2. \begin{bmatrix$}[r] 8 \end{bmatrix}

$3. \begin{bmatrix$}[r] 5 \end{bmatrix}

$4. \begin{bmatrix$}[r] -1 & 2 \ 3 & 4 \end{bmatrix}

If, $x \begin{bmatrix} 2 \ 3 \end{bmatrix} + y \begin{bmatrix} -1 \ 1 \end{bmatrix} = \begin{bmatrix} 10 \ 5 \end{bmatrix}$, then the value of xy is:

1. 3

2. -12

3. -6

4. 15