On a feasible region whose vertices are [(1,3), (1,8), (5,6), 910,3)], what is the maximum of the objective function R = 2x + 5y, and where does it occur?
2x + 5y
[(1,3), (1,8), (5,6), (10,3)]
(1,8) maximixes the function = 42
+817 
