please help and thank you

UP Fall 2021 2.5 pts FLORIDA D Question 18 Home Assignments A contour map for f(x. y) is given below. Determine the sign of au of ( P ). Discussions GatorEvals Grades 888 Honorlock 298 Quizzes Zoom Conferences O Of ( P) 0 S ay O Of ( P) = 0 ay O cannot be determined(enter integers or fractions; enter DNE if the limit does not exist) Honorlock 298 Quizzes Zoom Conferences D Question 17 6 pts Find the maximum value of f (x, y) = x - 2y subject to the constraint 2x2 + y2 = 18. 1. Set up a system of equations using the Method of Lagrange Multipliers: 1 = 1(4x) = 1(2y) 2x2 + y2 = 18 2. Solve for ) from the above system of equations. 3. maximum value of f = (enter integers or fractions)