Evaluate p = 50x 80y at each vertex of the feasible region. (0, 0) p = (0, 15) p = (6, 12) p = on a coordinate plane, 2 lines are shown. a line with positive slope goes through (0, 0) and (6, 12). a line with negative slope goes through (2, 14) and (6, 12). everything to the left of the lines is shaded up to the y-axis. there are points at (0, 0), (0, 15), and (6, 12).