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Ostrovityanka [42]
4 years ago
11

X + y + z = 7 2x − y + z = 7 3x − z = 2

Mathematics
1 answer:
soldi70 [24.7K]4 years ago
7 0
<span>A) X + y + z = 7
B) 2x − y + z = 7

C) 3x − z = 2
</span><span>C) z = 3x -2 Substituting this into equations A) and B)

</span>
<span>A) X + y + 3x -2 = 7
B) 2x − y + 3x -2 = 7 Adding A and B
3x + 6x -4 = 14
9x = 18
x = 2
</span>Since x = 2 then
<span>A) 2 + y + 6 -2 = 7
</span><span>A) y  = 1

</span>A) X + y + z = 7
<span>A) 2 + 1 + z = 7</span>
z = 4

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