Given the matrices $A = \begin{bmatrix} -3 & -4 \ -2 & 0 \ \end{bmatrix}$, $B = \begin{bmatrix} -1 & 4 \ 0 & 6 \ 2 & -5 \ \end{bmatrix}$ and the vectors $x = \begin{bmatrix} 1 \ -1 \ \end{bmatrix}$, $y = \begin{bmatrix} 4 \ 2 \ \end{bmatrix}$ compute the following: a) $Ax$ b) $Ay$ c) $Bx$ d) $By
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