Question

x-2y+3z=2
X-Y+7Z=7
2X+4Y+9Z=15

Answer 1

Olá Bruno

x - 2y + 3z = 2      (I)
x - y + 7z = 7        (II)
2x + 4y + 9z = 15 (III)

de (I) vem

x = 2y - 3z + 2
2x = 4y - 6z + 4

de (II) vem

2y - 3z + 2 - y + 7z = 7
y + 4z = 5

de (III) vem

4y - 6z + 4 + 4y + 9z = 15
8y + 3z = 11

y + 4z = 5
8y + 3z = 11

8y + 32z = 40 

29z = 29
z = 1

y + 4 = 5
y = 1

x = 2y - 3z + 2
x = 2 - 3 + 2 = 1

S = (1, 1, 1)

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