Given equation system:

$\displaystyle

\begin{cases}

x + 2y -1 =0;\\

2x + y -y =0;\\

4x + 5y - 6=0;\\

\end{cases}\\

$

At least in three sentences analyze this situation. What happens if x and y are lines?

I know that determinant is 0, so there is no solution. What else could I say?