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February 28, 2015

February 28, 2015

Posted by **me** on Saturday, February 19, 2011 at 4:03pm.

5x+3y+5z=-16

2x+5y-z=-26

x-4y+2z=10

- math -
**Reiny**, Saturday, February 19, 2011 at 6:21pm1st - 5(3rd) ---> 23y - 5z = -66

2nd - 2(3rd) ---> 13y - 5z = -36

subtract those ----> 10y = 30

y = 3

back in 13y-5z=-36

39 - 5y = -36

-5z = 75

z = -15

put y=3 and z=-15 into the original 3rd and you are done.

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