tentukan persamaaan tiga variable beriku x+y+z=0 2x+3y-z=8 4x-y-3z=8 beserta caranya
Matematika
hanifa871
Pertanyaan
tentukan persamaaan tiga variable beriku
x+y+z=0
2x+3y-z=8
4x-y-3z=8
beserta caranya
x+y+z=0
2x+3y-z=8
4x-y-3z=8
beserta caranya
2 Jawaban
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1. Jawaban Arkan5283
x + y + z = 0
2x + 3y - z = 8
4x - y - 3z = 8
x + y + z = 0
x = - y - z
2x + 3y - z = 8
2(- y - z) + 3y - z = 8
- 2y - 2z + 3y - z = 8
y - 3z = 8
4x - y - 3z = 8
4(- y - z) - y - 3z = 8
- 4y - 4z - y - 3z = 8
- 5y - 7z = 8
y - 3z = 8|× 7
- 5y - 7z = 8|× 3
7y - 21z = 56
- 15y - 21z = 24
___________—
22y = 32
y = 32/22
y = 16/11
y - 3z = 8
16/11 - 3z = 8
- 3z = 8 - 16/11
- 3z = 72/11
z = - 24/11
x = - y - z
x = - 16/11 + 24/11
x = 8/11
x = 8/11
y = 16/11
z = - 24/11
Maaf Kalau Salah -
2. Jawaban Wenson
Mapel : Matematika (Jurusan MIPA)
Kategori : SPLTV
Kelas : SMA / MA kelas X
Semester : Ganjil
Pembahasan:
Diketahui persamaan - persamaan:
x + y + z = 0
2x + 3y - z = 8
4x - y - 3z = 8
Eliminasi 1:
x + y + z = 0 |2| 2x + 2y + 2z = 0
2x + 3y - z = 8 |1| 2x + 3y - z = 8 -
-y + 3z = -8
y - 3z = 8
Eliminasi 2:
2x + 3y - z = 8 |2| 4x + 6y - 2z = 16
4x - y - 3z = 8 |1| 4x - y - 3z = 8 -
7y + z = 8
Eliminasi 3:
7y + z = 8 |-3| -21y - 3z = -24
y - 3z = 8 |1| y - 3z = 8 -
-22y = -32
y = 32/22
y = 16/11
Eliminasi 4:
7y + z = 8 |1| 7y + z = 8
y - 3z = 8 |7| 7y - 21z = 56 -
22z = -48
z = -48/22
z = -24/11
Substitusi:
x + y + z = 0
x = - y - z
x = - 16/11 + 24/11
x = 8/11
HP = { x = 8/11, y = 16/11, dan z = -24/11 }