Jika sistem persamaan 3x - y = 11 dan 2x + 3y = 0 diselesaikan, berapakah nilai dari x - 2y?

Answer and explanation

Correct answer: C. 7

Dari persamaan kedua: y = -2/3 x. Substitusi ke pertama: 3x - (-2/3 x) = 11 <=> (11/3) x = 11 <=> x = 3. Maka y = -2/3 * 3 = -2. Nilai x - 2y = 3 - 2(-2) = 3 + 4 = 7.

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