SOLUTION: i Have been trying to get these and i cant. will you help me solve x-y+z=-4 3x+2y-z=5 -2x+3y-z=15

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: i Have been trying to get these and i cant. will you help me solve x-y+z=-4 3x+2y-z=5 -2x+3y-z=15      Log On


   

Question 173523This question is from textbook intermediate algebra
: i Have been trying to get these and i cant. will you help me solve
x-y+z=-4
3x+2y-z=5
-2x+3y-z=15 This question is from textbook intermediate algebra

Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
adding 1st eqn and 2nd eqn __ 4x+y=1

subtracting 4x __ y=1-4x

adding 1st eqn and 3rd eqn __ -x+2y=11

substituting __ -x+2(1-4x)=11

distributing __ -x+2-8x=11

subtracting 2 __ -9x=9

dividing by -9 __ x=-1

substituting __ y=1-4(-1) __ y=5

substituting __ (-1)-(5)+z=-4

adding 6 __ z=2