Please help with systems of equations!!

x - 3y + 4z = -9
2x + y + 3z = 6
x - 4y + 3z = -9

I used substition and isolated x in the first equation. I then substiuted that into both equations. After i eliminated x i used elimination to solve for z and got 3.25.

Is this right?!

Question

Please help with systems of equations!!

x - 3y + 4z = -9 
2x + y + 3z = 6 
x - 4y + 3z = -9

I used substition and isolated x in the first equation. I then substiuted that into both equations. After i eliminated x i used elimination to solve for z and got 3.25. 

Is this right?!

anonymous · Answer

to know if you're right, plug in for x and y.

then plug those in to any row and see if for example

x + 3y + 4(3.25) = -9

anonymous · Answer

your methodology sounds correct though. substituting twice

anonymous · Answer

It solved and its not even close to right andi have no idea where i went wrong

anonymous · Answer

probably just an error with double negatives or something.