Finding the point

bes
2011 10 11
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I know the equation of a line N. there is a point P =(a,b) lying on the same plane. (not in that line) how can i find whether that point (a,b) lies right hand side of that line N or lefthand side? shall i find that by finding the normal vector to that line N

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Igor de Britto
Igor de Britto 2011-10-11

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Right or left hand side means above or under the line?
If so:
line_eq = k*x + n
P = (a,b)
if k*a + n > b
'under the line'
elseif if k*a + n < b
'above the line'
else
'on the line'
end

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bes
bes 2011-10-11
line eq = k*x = n means what? can you explain that interms of y=mx+c ( i know 2 points in that line (x1, y1) and (x2, y2))
Walter Roberson
Walter Roberson 2011-10-11
m = k
c = n
and now k*x + n is the same as m*x + c
bes
bes 2011-10-11
thankyou. this works fine

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