1
Nilai x, y, z memenuhi persamaan
3x-2=9-y+2z dan 8*.2=42y+z. Jika x =
y, maka nilai (x-2)²+2y=....
A. 1
D. 4
B. 2
E. 5
C. 3
Answer (4)
He's a Pirate from Pirates of the Caribbean has a 6/8 time signature.
A known song containing a 6/8 time signature is "We Are The Champions" by Queen, which provides a swung, lilting rhythm distinct from the common 4/4 time signature.
The subject of the question is the identification of a song with a 6/8 time signature that the student might have heard of. This time signature indicates that there are six beats in a measure with each eighth note receiving one beat. It is a compound meter, meaning that each of the two main beats can be divided into three parts, giving it a distinct rhythmic characteristic. A famous song that many people have likely heard and that is in 6/8 time is "We Are The Champions" by Queen. The 6/8 meter gives the song a swung, lilting feel that is different from the more common 4/4 time signature found in many pop and rock songs.
A popular song in 6/8 time signature is "He's a Pirate" from Pirates of the Caribbean. The 6/8 time signature has six beats in a measure, creating a flowing rhythm often used in various musical styles. Other examples include songs like "Norwegian Wood" by The Beatles.
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Jawaban:Persamaan 1:3x - 2 = 9 - y + 2zPersamaan 2:8 × 0.2 = 42y + z→ 8 × 0.2 = 1.6, jadi:1.6 = 42y + zDiketahui juga: x = yDan kita diminta mencari:(x - 2)² + 2y = ...--- Langkah 1: Substitusi x = y ke Persamaan 1Persamaan 1:3x - 2 = 9 - y + 2z→ Ganti y dengan x:3x - 2 = 9 - x + 2zGabungkan x:3x + x = 9 + 2z + 2→ 4x = 11 + 2z→ z = (4x - 11)/2 → (Persamaan A)--- Langkah 2: Substitusi y = x dan z dari (A) ke Persamaan 2Persamaan 2:1.6 = 42y + z→ Ganti y = x dan z = (4x - 11)/21.6 = 42x + (4x - 11)/2Samakan penyebut: 1.6 = (84x + 4x - 11) / 21.6 = (88x - 11)/2Kalikan silang:2 × 1.6 = 88x - 113.2 = 88x - 11→ 88x = 3.2 + 11→ 88x = 14.2→ x = 14.2 / 88 = 0.16136...Ternyata x bukan bilangan bulat dan tidak cocok dengan pilihan jawaban.--- Coba cek kemungkinan ada kesalahan ketik di soal: Apakah maksudnya 8 × 0.2 atau 8 × 2?Jika 8 × 2 = 16, maka persamaan menjadi:16 = 42y + zGunakan kembali Persamaan A:z = 4x - 11 / 2dan x = ySubstitusikan ke:16 = 42x + (4x - 11)/2Samakan penyebut:16 = (84x + 4x - 11)/216 = (88x - 11)/2Kalikan silang:32 = 88x - 1188x = 43x = 43 / 88 → Tetap tidak cocok--- Coba satu per satu nilai dari pilihan jawaban:Coba x = 1→ (x - 2)² + 2y = (1 - 2)² + 2×1 = 1 + 2 = 3→ C. 3Uji ke persamaan:Persamaan 1:3x - 2 = 9 - y + 2z3(1) - 2 = 9 - 1 + 2z1 = 8 + 2z → 2z = -7 → z = -3.5Persamaan 2:8 × 0.2 = 1.6 = 42y + z = 42(1) + (-3.5) = 38.5 ❌---Coba x = 2(x - 2)² + 2y = 0² + 4 = 4→ D. 4Persamaan 1:3(2) - 2 = 9 - 2 + 2z6 - 2 = 7 + 2z4 = 7 + 2z → 2z = -3 → z = -1.5Persamaan 2:1.6 = 42×2 + (-1.5) = 84 - 1.5 = 82.5 ❌---Coba x = 0(x - 2)² + 2y = 4 + 0 = 4Coba uji:Persamaan 1:3(0) - 2 = 9 - 0 + 2z-2 = 9 + 2z → 2z = -11 → z = -5.5Persamaan 2:1.6 = 42×0 + (-5.5) = -5.5 ❌---Coba x = 0.25(x - 2)² + 2x = (−1.75)² + 0.5 = 3.0625 + 0.5 = 3.5625 ❌---Coba x = 0.5(x - 2)² + 2x = 2.25 + 1 = 3.25 ❌---Tidak ada jawaban yang pas secara hitungan numerik. Tapi dari pilihan jawaban:Coba kembali x = 1(x - 2)² + 2x = 1 + 2 = 3 → Sesuai dengan C. 3Meskipun tidak cocok dengan z, bisa jadi soal hanya minta nilai dari ekspresi (x - 2)² + 2y jika x = y.---✅ Jawaban yang paling masuk akal adalah: C. 3Bantu kasih likenya ya, apabila jawaban ini membantu.
