4x+5-2x=8
-x+4y+z=6
Jawab:
Penjelasan dengan langkah-langkah:
2x + 4y - 3z = 1 ...............( 1 )
4x + 5y - 2z = 8 ...............( 2 )
-x + 4y + z = 6 ...............( 3 )
Persamaan ( 3 ) dikalikan 2
-2x + 8y + 2z = 12
2x + 4y - 3z = 1 ...............( 1 )
------------------------------------------ +
12y - z = 13 ................( 4 )
Persamaan ( 1 ) dikalikan 2
4x + 8y - 6z = 2
4x + 5y - 2z = 8 ...............( 2 )
--------------------------------------------- -
3y - 4z = - 6 .............( 5 )
Perhatikan pers ( 4 ) dan ( 5 )
12y - z = 13 ................( 4 )
3y - 4z = - 6 ..............( 5 )
Persamaan ( 5 ) dikalikan 4
12y - 16z = - 24
12y - z = 13 ................( 4 )
---------------------------------------- -
- 15z = -37
z = 37/15
y = 58/45
x = 613/45
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