Find the extremum of f(x,y) subject to the given constraint, and state whether it is a maximum or a minimum.
f(x,y) = 2x^2 + 3y^2 - 4xy; x + y = 9
Find the Lagrange function F(x,y,λ).
F(x,y,λ) = 2x^2 + 3y^2 - 4xy - λ(x + y - 9)
Find the partial derivatives F_x, F_y, and F_λ.
F_x = 4x - 4y - λ
F_y = 6y - 4x - λ
F_λ = -x - y + 9
There is a value of located at (x,y) =
(Type an integer or a fraction. Type an ordered pair, using integers or fractions.)