Smittyyy3
Smittyyy3
09-03-2017
Mathematics
contestada
x + y + z = 7
2x − y + z = 7
3x − z = 2
Respuesta :
wolf1728
wolf1728
09-03-2017
A) X + y + z = 7
B) 2x − y + z = 7
C) 3x − z = 2
C) z = 3x -2 Substituting this into equations A) and B)
A) X + y + 3x -2 = 7
B) 2x − y + 3x -2 = 7 Adding A and B
3x + 6x -4 = 14
9x = 18
x = 2
Since x = 2 then
A) 2 + y + 6 -2 = 7
A) y = 1
A) X + y + z = 7
A) 2 + 1 + z = 7
z = 4
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