() A rectangular photo frame encloses an area of 600 cm. The top edge of the frame is constructed out of heavier material than the other three sides. The material for the top edge weighs 200 g/cm and the other three sides are made from material weighing 100 g/cm. In this question we will calcula the dimensions of the frame that minimize the total weight. y a) Write an expression in terms of x and y for the total weight of the frame. Weight = g b) Find a constraint that allows you to express y in terms of y= c) The values of x and y that minimize the total weight are