Write down (without solving) the dual LP problem.
Maximize

p = x + y + z + w

subject to

\begin{array} { l } x + y + z \leq 9 \\y + z + w \leq 7 \\x + z + w \leq 2 \\x + y + w \leq 4 \\x \geq 0 , y \geq 0 , z \geq 0 , w \geq 0\end{array}

A)minimize

c = 9 s + 7 t + 2 u + 4 v

subject to

\begin{array} { l } s + u + v \leq 1 \\s + t + v \leq 1 \\s + t + u \leq 1 \\t + u + v \leq 1 \\s \geq 0 , t \geq 0 , u \geq 0 , v \geq 0\end{array}

B) minimize

c = s + t + u + v

subject to

\begin{array} { l } s + t + u \leq 7 \\t + u + v \leq 6 \\s + u + v \leq 3 \\s + t + v \leq 4 \\s \geq 0 , t \geq 0 , u \geq 0 , v \geq 0\end{array}

C) minimize

c = s + t + u + v

subject to

\begin{array} { l } s + t + u \geq 9 \\t + u + v \geq 7 \\s + u + v \geq 2 \\s + t + v \geq 4 \\s \geq 0 , t \geq 0 , u \geq 0 , v \geq 0\end{array}

D) minimize

c = s + t + u + v

subject to

\begin{array} { l } s + t + u \geq 9 \\t + u + v \geq 7 \\s + u + v \geq 2 \\s + t + v \geq 4 \\s \geq 0 , t \geq 0 , u \geq 0 , v \geq 0\end{array}

E) minimize

c = 9 s + 7 t + 2 u + 4 v

subject to

\begin{array} { l } s + u + v \leq 1 \\s + t + v \leq 1 \\s + t + u \leq 1 \\t + u + v \leq 1 \\s \geq 0 , t \geq 0 , u \geq 0 , v \geq 0\end{array}

Maximize ​ p=2x+3y+z+4wp = 2 x + 3 y + z + 4 wp=2x+3y+z+4w

Short Answer