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This is the 20 14 Jiangsu senior high school entrance examination mathematics volume with the answer ~

Solution: (1)∵ point m is on the image of straight line y=x, and the abscissa of point m is 2.

∴ The coordinate of point m is (2,2),

If m (2 2,2) is substituted into y=﹣x+b to get ﹣ 1+b=2, the solution is b=3, and the analytical formula of the linear function is y=﹣x+3.

Substituting y=0 into y=﹣x+3 gives ﹣x+3=0, and x=6, and the coordinate of point A is (6,0);

(2) Substitute x=0 into Y =-X+3 to get y=3, and the coordinates of point B are (0,3), CD = OB, CD = 3 and PC X axis.

The coordinate of point ∴c is (a, ﹣a+3), and the coordinate of point ﹣ D is (a, a) ﹣ a+3) = 3.

∴a=4

This part is incomplete ~