Find the optimum value for each objective function given in Problems 47-51.

Minimize \(A=2 x-3 y\) subject to the constraints of Problem 39.

Data from problem 39

\(\left\{\begin{array}{l}x \geq 0 \\ y \geq 0 \\ x+y \leq 8 \\ y \leq 4 \\ x \leq 6\end{array}ight.\)