Ubah ke dalam subtitusi 2x+y-3z=-5 X+2y+z=8 X-2y+3z=6

Materi : SPLTV

2x + y - 3z = -5 ....... 1)
x + 2y + z = 8 .......... 2)
x - 2y + 3z = 6 ......... 3)

x + 2y + z = 8
x - 2y + 3z = 6
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4y - 2z = 2 .............. 4)

2x + y - 3z = -5 ..... ×1
x + 2y + z = 8 ......... ×2
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2x + y - 3z = -5
2x + 4y + 2z = 16
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-3y - 5z = -21 ......... 5)

4y - 2z = 2 ........... × 3
-3y - 5z = -21 ........ ×(-4)
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12y - 6z = 6
12y + 20z = 84
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-26z = -78
z = 3

4y - 2z = 2
4y - 2(3) = 2
4y - 6 = 2
4y = 2 + 6
4y = 8
y = 2

x + 2y + z = 8
x + 2(2) + 3 = 8
x + 4 + 3 = 8
x + 7 = 8
x = 8 - 7
x = 1

Hp = { 1 , 2 , 3 }