The shaded region in the figure is the solution set of the inequalities:
.png)
$4x + 5y \geq 20, \, 3x + 10y \leq 30, \, x \leq 6, \, x, y \geq 0.$
$4x + 5y \geq 20, \, 3x + 10y \leq 30, \, x \geq 6, \, x, y \geq 0.$
$4x + 5y \leq 20, \, 3x + 10y \leq 30, \, x \leq 6, \, x, y \geq 0.$
$4x + 5y \geq 20, \, 3x + 10y \leq 30, \, x \geq 6, \, x, y \geq 0.$
.png)