4x+3y+z=16 2x+7y+3z=8 x-3y-2z= -14
Matematika
Egantreshando07
Pertanyaan
4x+3y+z=16
2x+7y+3z=8
x-3y-2z= -14
2x+7y+3z=8
x-3y-2z= -14
1 Jawaban
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1. Jawaban Arkan5283
4x + 3y + z = 16
2x + 7y + 3z = 8
x - 3y - 2z = - 14
4x + 3y + z = 16
z = 16 - 4x - 3y
2x + 7y + 3z = 8
2x + 7y + 3(16 - 4x - 3y) = 8
2x + 7y + 48 - 12x - 9y = 8
- 10x - 2y = 8 - 48
- 10x - 2y = - 40
x - 3y - 2z = - 14
x - 3y - 2(16 - 4x - 3y) = - 14
x - 3y - 32 + 8x + 6y = - 14
9x + 3y = - 14 + 32
9x + 3y = 18
- 10x - 2y = - 40|× 3
9x + 3y = 18|× 2
- 30x - 6y = - 120
18x + 6y = 36
____________+
- 12x = - 84
x = 7
9x + 3y = 18
63 + 3y = 18
3y = 18 - 63
3y = - 45
y = - 15
z = 16 - 4x - 3y
z = 16 - 28 + 45
z = 33
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