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August 21, 2014

August 21, 2014

Posted by **Dorothy** on Friday, November 5, 2010 at 8:18pm.

x + 3y – z = 2

x – 2y + 3z = 7

x + 2y – 5z = –21

- Algebra -
**Damon**, Friday, November 5, 2010 at 8:30pmx + 3y – z = 2

x – 2y + 3z = 7

------------------

0x +5y -4z = -5

x – 2y + 3z = 7

x + 2y – 5z = –21

-----------------

0x -4y + 8z = 28 or -2y+4z=14

then

+5y -4z = -5

-2y +4z = 14

----------------

3 y +0z = 9

y = 3

now go back up and get x and z

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