Finding the point

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

Answer 1

[Igor de Britto]

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

[bes]

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]

m = k

c = n

and now k*x + n is the same as m*x + c

[bes]

thankyou. this works fine