2, the second quadrant X is negative, x=-3, Y is negative, Y =-2;

3. Four possibilities (3,4) or (-3,4) or (-3,4) or (3,4).

4, 9-3 quadrant angle bisector equation y=x, so the solution 2m-2=3m, m=-2.

5、(-3, 1)

6. regarding the axisymmetry of x, x is equal, y is opposite, and x+y=-2+3= 1.

7. X in A and B is equal, Y is opposite, X in B and C is opposite, Y is equal, X and Y in A and C are opposite, and they are symmetrical about the origin.