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2/3x - 1/4y = 5 (kalikan dengan 6)
4x - 2/3 y = 30
7/6 x + 3/2 y = 1
________________ +
4x + 7/6 x = 31
x = 6
Substitusi ke persamaan 1
2/3 x - 1/4 y = 5
2/3 . 6 - 1/4 y = 5
y = -4
Nilai dari x - 2y ⇒ 6 - 2 . (-4) ⇒ 14
Jawaban D