The shaded region is the solution set of the inequalities.
$5x + 4y \geq 20,\ x \leq 6,\ y \geq 3,\ x \geq 0,\ y \geq 0$
$5x + 4y \leq 20,\ x \leq 6,\ y \leq 3,\ x \geq 0,\ y \geq 0$
$5x + 4y \geq 20,\ x \leq 6,\ y \leq 3,\ x \geq 0,\ y \geq 0$
$5x + 4y \geq 20,\ x \geq 6,\ y \leq 3,\ x \geq 0,\ y \geq 0$
