Question 256815
Determine the value of (x + y + z) if, 
3x – 2y – 3z = -1
6x + y + 2z = 7
9x + 3y + 4z = 9
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I used a calculator matrix function to get:
x = 2/3
y = -3
z = -3
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x + y + z = 2/3
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Cheers,
Stan H.