As shown in the figure, point A is inversely proportional to point B? Y=kx, the abscissas of point A and point B are A and 2A (A > 0) respectively, the AC⊥x axis, the vertical foot is point C, and the area of △AOC is 2.
(1) Find the analytical expression of the inverse proportional function;
(2) If the points (-a, y 1) and (-2a, y2) are on the image of the inverse proportional function, try to compare the sizes of y 1 and y2;