Graph each system of inequalities. Name the coordinates of the vertices of the feasible region. Find the maximum and minimum values of the given function.

14. 5zy 2-3

4x + y ≤ 5

-2x + y ≤ 5

f(x, y) = 4x - 3y

15. x2-10

1zyz-6

3x + 4y ≤-8

2yzx-10

f(x, y) = 2x + y