Latihan eliminasi Gauss Jordan 1

بِسْمِ اللّهِ الرَّحْمَنِ الرَّحِيْمِ 

Penyelesaian persamaan linier dalam bentuk matriks dapat dilakukan melalui beberapa cara, yaitu dengan eliminasi Gauss atau dapat juga dengan cara eliminasi Gauss-Jordan. Namun, suatu sistem persamaan linier dapat diselesaikan dengan eliminasi Gauss untuk mengubah bentuk matriks teraugmentasi ke dalam bentuk eselon-baris tanpa menyederhanakannya. Cara ini disebut dengan substitusi balik.

Soal :
x + 2y + 3z = 6
2x – 3y + 2z = 14
3x + y – z = -2

Mempunyai solusi :
x = 1, y = -2, z = 3

Penyelesaian : 
Pembuktian Menggunakan Eliminasi Gauss Jordan.



Add (-2 * row1) to row2
1
2
3
6
0
-7
-4
2
3
1
-1
-2

Add (-3 * row1) to row3
1
2
3
6
0
-7
-4
2
0
-5
-10
-20

Divide row2 by -7
1
2
3
6
0
1
4/7
-2/7
0
-5
-10
-20

Add (5 * row2) to row3
1
2
3
6
0
1
4/7
-2/7
0
0
-50/7
-150/7

Divide row3 by -50/7
1
2
3
6
0
1
4/7
-2/7
0
0
1
3

Add (-4/7 * row3) to row2
1
2
3
6
0
1
0
-2
0
0
1
3

Add (-3 * row3) to row1
1
2
0
-3
0
1
0
-2
0
0
1
3

Add (-2 * row2) to row1
1
0
0
1
0
1
0
-2
0
0
1
3


Finish.

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