If $\left[\begin{array}{cc}1 & 1 \\ -1 & 1\end{array}\right]\left[\begin{array}{l}x \\ y\end{array}\right]=\left[\begin{array}{c}2 \\ 4\end{array}\right]$,then the values of $x$ and $y$ respectively are

  • A
    $3, -1$
  • B
    $1, 3$
  • C
    $3, 1$
  • D
    $-1, 3$

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