As shown in the figure, in the rectangular coordinate plane, the image of the function y = m / X (x greater than 0, M is a constant) passes through two points a (1,4) B (a, b), where A is greater than 1, a is the vertical line of x-axis through point a, C is the vertical line of y-axis through point B, and D is the vertical line of D. connect ad, DC and CB If the area of △ abd is 4, find the coordinates of point B The function analytic expression of ob

As shown in the figure, in the rectangular coordinate plane, the image of the function y = m / X (x greater than 0, M is a constant) passes through two points a (1,4) B (a, b), where A is greater than 1, a is the vertical line of x-axis through point a, C is the vertical line of y-axis through point B, and D is the vertical line of D. connect ad, DC and CB If the area of △ abd is 4, find the coordinates of point B The function analytic expression of ob

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