Find $t$ such that (subspace) For $t\in\mathbb{R}$ a subspace of $\mathbb{R}^4$ is given $V_t={\rm span}([t, -1, 2,-1],[1,-1,-1,1])$. 
Find all $t\in\mathbb{R}$ such that $V_t={\rm span}([4, -3,  0,1],[1,0, 3,-2])$. 
EDIT: Still do not know how to solve the question

you have to solve the equations 
\begin{equation}
[4,-3,0,1]=\alpha[t,-1,2,-1]+\beta[1,-1,-1,1]
\end{equation}
and
\begin{equation}
[1,0,3,-2]=\alpha[t,-1,2,-1]+\beta[1,-1,-1,1].
\end{equation}
The solution for $t$ is 2.
