$\begin{cases} 3x - 2y + z = 8 \\ 4x - y + 3z = -1\\ 5x + y + 2z = -1 \end{cases}$
Form two equations with y elimanted.
It would be really helpful too see what you guys wrote.
$\begin{cases} 3x - 2y + z = 8 \\ 4x - y + 3z = -1\\ 5x + y + 2z = -1 \end{cases}$
Form two equations with y elimanted.
It would be really helpful too see what you guys wrote.
Hint: just subtract equation $(2)$ from $(3)$ and add to equation $(1)$ to get your $x$.
You could solve one of the three equations for $y$ (I recommend the second or the third), then substitute that into the other two equations (don't forget to simplify by gathering like terms).
Add the second and third equations. Then add the first equation to twice the third equation.