Find the Values of the Variables for Which the Statement $$\left[ \begin{array} { r r } 9 & - 1 \\6 & 7\end{array} \right] = \left[ \begin{array} { c c } x & - 1 \\y & z\end{array} \right]$$

Multiple Choice

Find the values of the variables for which the statement is true, if possible.
- $$\left[ \begin{array} { r r } 9 & - 1 \\6 & 7\end{array} \right] = \left[ \begin{array} { c c } x & - 1 \\y & z\end{array} \right]$$

A) $x = 6 ; y = 7 ; z = 9$
B) $x = 9 ; y = 6 ; z = 7$
C) $x = - 9 ; y = 7 ; z = 6$
D) $x = - 9 ; y = - 6 ; z = - 7$