Proof that $ax=0$ has not only the trivial solution in order the system be linearly dependent

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I have some vectors and i want to show that they are linearly dependent. I know that they're deterninant is zero. Is this the solution? I must do it with $Ax=0$, because i should use homogeneus system, how can i tell that this equation has not only the trivial solution?

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we get non-trivial solution from Ax=0 if number of unknowns is greater in number than equations in this system.