Posted by **ann :)** on Thursday, September 13, 2012 at 7:25pm.

2x+y=-2 (1)

x+y-z=-4 (2)

3x+5y+z=0 (3)

solve the system

need help quick!

- college algebra -
**Reiny**, Thursday, September 13, 2012 at 7:43pm
add the last two:

4x + 6y = -4

from the 1st: y = -2-2x

sub into above new equation:

4x + 6(-2-2x) = -4

4x - 12 - 12x = -4

-8x = 8

x = -1

then y = -2+2 = 0

in the 2nd:

x+y-z=-4

-1+0-z=-4

-z=-3

z=3

x=-1

y=0

z=3

- college algebra -
**ann :)**, Thursday, September 13, 2012 at 7:48pm
12x+4y+2z=-7 (1)

3x-12y+6z=-4 (2)

9x-16y+4z=-3 (3)

solve the system

just need the steps how to do it

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