If the orders of matrices A and B are m × n and p × q respectively, then which of the following is true for the product BA?

1. m = p

2. m = q

3. n = p

4. n = q

If P and Q are two different matrices of order 3 × n and n × p, then the order of the matrix PQ is:

1. 3 × p

2. p × 3

3. n × n

4. 3 × 3

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