Question 7 (2 points) Describe the region in the xy-plane that corresponds to the domain of the function g(x, y) = In(3-x-y). ()a) The domain is the half plane above the line y = -x + 3 and all the points on the line y = -x + 3. (b) The domain is the half plane above the line y = -x + 3 c) The domain is all the points on the line y = -x + 3 The domain is the half plane below the line y = -x +3 and all the points on the line y = -x + 3. De) The domain is the half plane below the line y =-x + 3. Question 8 (2 points) Find and simplify f(x, y) = 6 + 5x - 5y at (2,1). a) -9