@ @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)