(a)
Given, $z = 2x_{1} + 3x_{2}$
[image:12_image13.jpeg]
At $D(0,\ 10)$
$z = 2(0) + 3(10) = 30$
At $B(1,\ 5)$
$z = 2(1) + 3(5) = 17$
At $A(4,\ 2)$
$z = 2(4) + 3(2) = 14$
At $C(11,\ 0)$
$z = 2(11) + 3(0) = 22$
The minimum value of $z$ is 14