The length of the perpendicular from the point (1,1) to the line 3x-y+1=0,is______.
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(1,1)=(x,y)
3×1-1+1=0
3-1+1=0
2+1=0
3=0
3×1-1+1=0
3-1+1=0
2+1=0
3=0
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