X+Y+Z = 2
or 2X +2Y +2 Z = 4
2X +y -Z -2X -2Y -2Z = 5 -4
or -Y -3Z = 1 ... Eq A
also 2X +Y -Z -2X +2Y -2Z = 5+4
3Y - 3Z = 9......... Eq B
from A and B
4Y = 8
Y =2 and Z = -1
X + 2 - 1 = 2
Gives X = 1
Lane M.
asked 03/13/17
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