M12-20

Hi toby001,

This can be solved algebraically, but it will consume a lot of your time.
I feel this approach is most appropriate for GMAT, since you would be given a scratch paper, which is having graph available. You just need to plot the co-ordinates...

Coming to your question.
Find the line perpendicular and that passes through the points in options.
Once you get the line again solve for distance between the line and point of interception of both lines.

The following is the formula to find the distance from a point to the line.

The distance from a point (m, n) to the line Ax + By + C = 0 is given by:

d = {​∣Am+Bn+C∣}/ {\sqrt{(A^2 + B^2}}

+1 Kudos. If found helpful

Cheers,
Harry
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