Solve For $x$ And $y$ A) $x = - 2$ $y = - 1$

Solve $\left[ \begin{array} { l l } 1 & 2 \\3 & 4\end{array} \right] \left[ \begin{array} { l } x \\y\end{array} \right] = \left[ \begin{array} { l } 1 \\2\end{array} \right]$ for $x$ and $y$

A) $x = - 2$ , $y = - 1$

B) $x = - \frac { 3 } { 2 }$ , $y = - 2$

C) $x = 0$ , $y = \frac { 1 } { 2 }$

D) $x = \frac {3} { 2 }$ , $y = - \frac { 3 } { 2 }$

E) none