Respuesta :

if you are writing it in the form y = mx + c
  then you know that c it the y-intercept m the gardient

if you know the gradient of the peropendicular line then reciprocate that gradient and multiply it by  - 1 to get the gradient.

e.g.  gradient of perpen. = 2   and y intercept = 9
   
       then gradient of line  =  - 
[tex] \frac{1}{2} [/tex]

Thus equation would be y = - [tex] \frac{1}{2} [/tex] x  + 9
For a perpendicular line, you use the negative reciprocal. Meaning if you wanted the perpendicular slope of 5/3 you would get -3/5. And the y-intercept is you last portion. Say your equation to a perpendicular line is y=-3/4x-7 and your y-intercept is 5 then your other equation would be y=4/3x+5.
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