What is the is point-slope (3,1) m=0?

The question is vague.
I will assume you're asking What is the point-slope equation of a line which has a gradient of 0 and contains the point (3,1)?
Since the gradient is 0, the line is horizontal or of the form 

Since from the point we can recognize that the value of y is 1, the resulting equation is 

1. y=32. x=-13. n=-40

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