A firm has the production function f(x, y) = min {2x, x + y}. On the graph below, use red ink to sketch a couple of production isoquants for this firm. A second firm has the production function f(x, y) = x + min{x, y}.Do either or both of these firms have constant returns to scale? ________. On the same graph, use black ink to draw a couple of isoquants for the second firm.