Determine the Value of Each Variable $\left[ \begin{array} { r r } x + 3 & y + 4 \\ 7 & 8 \end{array} \right] = \left[ \begin{array} { l l } 6 & 9 \\ 7 & k \end{array} \right]$

Multiple Choice

Determine the value of each variable.
- $\left[ \begin{array} { r r } x + 3 & y + 4 \\ 7 & 8 \end{array} \right] = \left[ \begin{array} { l l } 6 & 9 \\ 7 & k \end{array} \right]$

A) $x = 3 ; y = 8 ; k = 6$
B) $x = 6 ; y = 9 ; k = 8$
C) $x = 3 ; y = 5 ; k = 8$
D) $x = - 3 ; y = - 5 ; k = - 8$