Find the corners of the feasible region

The graph of the feasible region is shown. f = 7x + 4y 2x + y = 40 x + 5y = 100 8x + 5y = 170 x Find the corners of the feasible region. (Order your answers from smallest to largest x, then from smallest to largest y.) ( x, y ) = ( x, y ) = (x, y ) = ( x, y ) = ( x, y ) = Find the maximum and minimum of the given objective function (if they exist). (If an answer does not exist, enter DNE.) maximum f = minimum f =