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