# Math Help - help find the denominator

1. ## help find the denominator

$x-y+3z=1,
2x+z=0,
-x+y-3z=0$

Please let me know how to solve this question

2. I am not sure what the title of this thread has to do with the problem, but...
To solve this you will want to solve for $x$ in the first equation, then substitute that into the second equation. Now solve for $y$ in the second equation, then substitute that and what you got for $x$ into the third equation. At this point the third equation should be in terms of $z$ only. Finally, sovle for $z$. This last step will give you a number. Now use this to determine $y$ and finally use both $y,z$ to determine $x$.