Please help me answer these two questions.

Find the extremum of f(x,y) subject to the given constraint, and state whether it is a maximum or a minimum. 2 -V f ( x,y) = 7 -x - y ;x+2y=5 There is a. value of located at (x,y) = (Simplify your answers.) 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 ) = 3x2 + y: 3x + 3y=72 There is a value of located at (x, y) = (Simplify your answers.)