vertices of the feasible region. Find the maximum and minimum
values of the given function.
14. 5≥y≥-3
4x + y ≤ 5
-2x + y ≤ 5
f(x, y) = 4x - 3y
15. x>-10
1 ≥y 2-6
3x + 4y ≤ -8
2y ≥ x - 10
f(x, y) = 2x + y