I need to solve the following LPP using graphical method
Min $z=-2x_1+x_2$
subject to $x_1+x_2 \geq 6$,
$3x_1+2x_2 \geq 16$,
$x_2 \leq 9$,
$x_1, x_2 \geq 0$
The common feasible region is unbounded. I am not sure whether the solution is also unbounded or not. In this case I have drawn the line $-2x_1+x_2=2$ and moved it towards the origin as it is a minimisation problem. I am not getting any optimal point. 
How can I take decision