SOLUTION: 3x+9y+6z=3 2x+y-z=2 x+y+z=2 How would I solve this matrix to find x,y and z using any method by hand?

Algebra ->  Matrices-and-determiminant -> SOLUTION: 3x+9y+6z=3 2x+y-z=2 x+y+z=2 How would I solve this matrix to find x,y and z using any method by hand?      Log On


   

Question 755804: 3x+9y+6z=3
2x+y-z=2
x+y+z=2
How would I solve this matrix to find x,y and z using any method by hand?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
3x+9y+6z=3
2x+y-z=2
x+y+z=2
How would I solve this matrix to find x,y and z using any method by hand?
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Divide the 1st eqn by 3.
Multiply eqn 1 & 3 by 2, hen all the x terms have a coefficient of 2.
Eliminate x
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Then it's 2 eqns in y & z.