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Eliminasi kedua persamaan.
3x + 9y = 36
3x + 8y = 16
----------------- --
y = 20
Substitusi y = 20 ke persamaan kedua.
3x + 8y = 16
3x + 8(20) = 16
3x + 160 = 16
3x = 16 - 160
3x = - 144
x = - 48
Jadi, { x , y } = { - 48 , 20 }