m？ -6n+9+n？ -4n+4=0

(m-3)？ +(n-2)？ =0

m=3，n=2

∴A(3,3)B(-2,2)

The analytical formula of ∴ straight line is y= 1/5x+ 12/5.

2. The meaning of this question is:

Substitute the (0,0) point into the original analytical formula to get m=o or m=-√3.

The original problem is a linear function.

∴k≠0

∴m≠-√3

∴m=0

This step must be written, otherwise it will be incomplete.