Constructing the dual of an LPP and checking each constraint's direction

Consider the LPP: Minimize $Z=4x_1+6x_2+18x_3$ subject to $x_1+3x_2\ge3, x_2+2x_3\ge5, x_1,x_2,x_3\ge0$. Then, which of the following is not a constraint in the corresponding dual problem? (Assume that $w_1$ and $w_2$ are the dual variables.)