If you mean points of (2, 1) and (0, -5) then the slope of the line is 3
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Points: (2, 1) and (5, 3) Slope: 2/3
It is not possible to answer the question because, thanks to the rubbish browser that we are forced to use, we cannot tell whether the coordinates of F are (2, 10) or (21, 0).
The general equation of the line is y = 3x + c. Having only one coordinate (21) of a point on this line is not enough to evaluate c.
If you mean passing through the point (-2, 1) then the parallel line will have the same slope but with a different y intercept.
If you mean center (6, 4) and coordinate (2, 1) then it is: (x-6)^2 +(y-4)^2 = 25