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@ @QPQ@  @pý†bɾa@                            @

  ()                3x + 4y = 11             )

   yx     .M
                                () ()
   .(
         .L M
  ()
  ()                          .          (.)

         [Elimination Method]

                                         .
                                         ()

          3x + y = 5
         3x + 4y = 11

                                 −1 ( )

                         3y = 6  .y = 2

         () y

         3x + 2 = 5

         3x = 3

         x =1

            .(x,y) = (1,2)
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