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## Homework Statement

For which B and D the line [tex]\left\{\begin{matrix}

x-2y+z-9=0 & \\

3x+By+z+D=0 &

\end{matrix}\right.[/tex] is in xy-plane ?

## Homework Equations

## The Attempt at a Solution

I found the line:

[tex]\frac{x-\frac{-D+9}{2}}{2-B}=\frac{y}{2}=\frac{z-\frac{D+27}{2}}{B+6}[/tex]

What should I do next?