(See Solution) The following subsections will be solved by the addition and subtraction method Reduction). lx+y=1 , 2 x+y=5 lx+y=-1 , x+3


Question: The following subsections will be solved by the addition and subtraction method Reduction).

  1. \(\left\{\begin{array}{l}x+y=1 \\ 2 x+y=5\end{array}\right.\)
  2. \(\left\{\begin{array}{l}x+y=-1 \\ x+3 y=-5\end{array}\right.\)

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