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Mathematics
Gavyn Brewer
1 September, 19:31
X-y+z=-1
x+y+3z=-1
2x-y+2z=0
+3
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1
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Dayami Stevens
1 September, 22:49
0
1x - 1y + 1z = - 1 ⇒ 1x - 1y + 1z = - 1
1x + 1y + 3z = - 1 ⇒ 1x + 1y + 3z = - 1
2x - 1y + 2z = 0 ⇒ 2x + 4z = - 2
1x - 1y + 1z = - 1 ⇒ 1x + 1y + 3z = - 1
1x + 1y + 3z = - 1 ⇒ 2x - 1y + 2z = 0
2x - 1y + 2z = 0 ⇒ 3x + 5z = - 1
2x + 4z = - 2 ⇒ 10x + 20z = - 10
3x + 5z = - 1 ⇒ 12x + 20z = - 4
-2x = - 6
-2 - 2
x = 3
2x + 4z = - 2
2 (3) + 4z = - 2
6 + 4z = - 2
- 6 - 6
4z = - 8
4 4
z = - 2
x - y + z = - 1
3 - y + (-2) = - 1
3 - y - 2 = - 1
3 - 2 - y = - 1
1 - y = - 1
- 1 - 1
-y = - 2
-1 - 1
y = 2
(x, y, z) = (3, 2, - 2)
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