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3/4x + 1/2 y= 3 | *4 =>> menjadi 3x+2y = 12
pakai cara eliminasi =>> 3x+8y=30 - 3x+2y=12
hasil pengurangan => 6y=18 =>> y=18/6 =>> y=3
pakai substitusi 3x+2y=12 =>> 3x+2(3)=12 =>> 3x+6=12 =>> 3x=12-6 =>> x=6/3
=>> x=2
sehingga nilai x=2 dan nilai y=3