2: Use the big-M method to solve the following LP: \[ \begin{array}{ll} \max & -3 x_{1} \\ \text { s.t. } & 2 x_{1}+x_{2} \geq 5 / 2 \\ & 3 x_{1}+2 x_{2}=4 \\ & x_{1}, x_{2} \geq 0 \end{array}