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through face to face fedback
MS - 60 means uncirculated but with some scratches. The higher the number on a scale of 1 through 70, the better the coin's condition.
The general form is 11x - 10y + 19 = 0
No, you draw a general line through the middle of the points.(A line of fit)
It is a line through the point of symmetry. In general it is not an axis of symmetry.