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August 20, 2014

August 20, 2014

Posted by **XOCHIL** on Friday, March 30, 2012 at 9:51pm.

x+y+z=8

2y+4y+2z=26

-x+8y-3z=26

- ALGEBRA -
**Reiny**, Friday, March 30, 2012 at 10:15pmI think your second equation is probably

2x+4y+2z=26

add the first and third ---> 9y - 2z = 34 (#1)

multiply third by 2

-2x + 16y - 6z = 52

add that to the second

20y -4z = 78

10y - 2z = 39 (#2)

#2 - #1 : ----> y = 5

sub into #1

45 - 2z = 34

-2z = -11

z = 5.5

back into the first

x + 5 + 5.5 = 8

x = -2.5

x = -2.5

y= 5

z = 5.5

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