​Use the Matrix Capabilities of a Graphing Utility to Solve $$\left\{ \begin{array} { c c c } 15 x - 5 y & = & 3 \\10 x + 10 y & = & 6 \\20 z & = & - 12\end{array} \right.$$

Multiple Choice

​Use the matrix capabilities of a graphing utility to solve the following system of linear equations: $$\left\{ \begin{array} { c c c } 15 x - 5 y & = & 3 \\10 x + 10 y & = & 6 \\20 z & = & - 12\end{array} \right.$$

A) ​ $$\left[ \begin{array} { l } x \\y \\z\end{array} \right] = \left[ \begin{array} { c } \frac { - 3 } { 10 } \\\\\frac { 9 } { 10 } \\\\\frac { - 3 } { 5 }\end{array} \right]$$
B) ​ $$\left[ \begin{array} { l } x \\y \\z\end{array} \right] = \left[ \begin{array} { c } \frac { 9 } { 10 } \\0 \\\frac { - 3 } { 5 }\end{array} \right]$$
C) ​ $$\left[ \begin{array} { l } x \\y \\z\end{array} \right] = \left[ \begin{array} { c } \frac { - 3 } { 10 } \\\\\frac { 3 } { 10 } \\\\\frac { - 3 } { 5 }\end{array} \right]$$
D) ​ $$\left[ \begin{array} { l } x \\y \\z\end{array} \right] = \left[ \begin{array} { c } \frac { 3 } { 10 } \\\\\frac { - 3 } { 10 } \\\\0\end{array} \right]$$
E) ​ $$\left[ \begin{array} { l } x \\y \\z\end{array} \right] = \left[ \begin{array} { c } \frac { 3 } { 10 } \\\\\frac { 3 } { 10 } \\\\\frac { - 3 } { 5 }\end{array} \right]$$