Can someone solve this System, (1equation, 3 variables)

[ends]

-2x - 9y + 3z = -8

I set parameters, and i get

x= 4 - 4.5s + 1.5t
y = s
z = t

But the database I'm using says it's incorrect...

 

[I like Serena]

-2x - 9y + 3z = -8

I set parameters, and i get

x= 4 - 4.5s + 1.5t
y = s
z = t

But the database I'm using says it's incorrect...

Welcome to MHB, ends! :)

What you write is correct.
There is no problem there.
So if your database says it's incorrect, the mistake must be somewhere else.

Can you give us the full problem statement?
What is asked exactly?