How do I solve system of equations in three variables? Ex: 2x+y-z=-8
4x-y+2z=-3
-3x+y+2z=5

First, try making equations with two variables, which you'll then solve simultaneously.

For example:



---a.



Sub a in 2.





----b.



Sub a in 3.



----c

now, solve b and c simultaneously!

:)