3x - 4y = 14 dan 1/3x + y = 3 adalah x = a dan y = b. Nilai a - 3b adalah ?
FajarWiraFaiz
(1/3x + y = 3) x 3 => x+3y = 9 3x - 4y = 14 l x 1 l => 3x - 4y = 14 x - 3 y = 9 l x 3 l => 3x + 9y= 27 - ------------------ -13y = -13 y = -13/-13 = 1 cari x... x + 3y = 9 x + 3 x 1 = 9 x = 9-3 x = 6 a-3b = x-3y = 6 - 3 x 1 = 6 - 3 = l 3 l
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