Find the exact extreme values of the function
f(x, y) = x - 7 + y - 1 + 230
subject to the following constraints: 0 ≤ y ≤ 10√r + 20y ≤ 200. Complete the following x xy. Note that since this is a closed and bounded feasibility region, there is an absolute minimum value of the function on the hyperbolic paraboloid.