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2x+y=64000 [1] 2x+y=640000
x +2y=740000 [2] 2x+4y=1480000
---------------------------------------------------- ---- (dikurang)
-3y=-840000
y=-840000/-3
=280000
x+2y=740000
x+2(280000)=740000
x+560000=740000
x=740000-560000=180000
jadi, x(kursi) = Rp.180.000,00 dan y(meja) = Rp.280.000,00
Maaf ya saya tdk krjkn yg no.2 dan 3-nya...krn saya lupa rumusny...skali lg maaf ya...