Given equation system:

<br /> <br />
\begin{cases}<br />
x + 2y -1 =0;\\<br />
2x + y -y =0;\\<br />
4x + 5y - 6=0;\\<br />
\end{cases}\\<br />



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?