x - 4y - 2z = 21 ; 2x + y + 2z = 3 ; 3x - 2y - z = -2
Matematika
ebi34
Pertanyaan
x - 4y - 2z = 21 ; 2x + y + 2z = 3 ; 3x - 2y - z = -2
1 Jawaban
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1. Jawaban BSunShine
Materi : SPLTV
Kelas : X SMA
x - 4y - 2z = 21 ....... 1)
2x + y + 2z = 3 ....... 2)
3x - 2y - z = -2 ........ 3)
x - 4y - 2z = 21
2x + y + 2z = 3
◆◆◆◆◆◆◆◆◆◆◆◆ [+]
3x - 3y = 24 ............ 4)
2x + y + 2z = 3 ..... ×1
3x - 2y - z = -2 ..... ×2
◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆
2x + y + 2z = 3
6x - 4y - 2z = -4
◆◆◆◆◆◆◆◆◆◆◆◆◆◆[+]
8x - 3y = -1 ............ 5)
3x - 3y = 24
8x - 3y = -1
◆◆◆◆◆◆◆◆◆◆ [-]
-5x = 25
x = -5
8x - 3y = -1
8(-5) - 3y = -1
-40 - 3y = -1
-3y = -1 + 40
-3y = 39
y = -13
x - 4y - 2z = 21
-5 - 4(-13) - 2z = 21
-5 + 52 - 2z = 21
47 - 2z = 21
-2z = 21 - 47
-2z = -26
z = 13
Hp = { -5 , -13 , 13 }