If the image with inverse scale function y = K / X passes through point a, point a is on the angular bisector of the fourth quadrant, and OA = 3 pieces of 2, the analytic expression of inverse scale function y = K / X is

If the image with inverse scale function y = K / X passes through point a, point a is on the angular bisector of the fourth quadrant, and OA = 3 pieces of 2, the analytic expression of inverse scale function y = K / X is

Because OA = 3 root 2 (your 3 root 2 is triple root 2), and because a is in the fourth quadrant, x = 3, y = - 3, k = xy = - 9, y = - 9