Mathhelp346
  • Mathhelp346
Write an equation that contains the given point and is perpendicular to the given line: (4,-1), y=-8
Mathematics
jamiebookeater
  • jamiebookeater
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Mathhelp346
  • Mathhelp346
I tried \[y-y _{1}=m(x-x _{1})\] but i would always get a value for y which isnt right
anonymous
  • anonymous
I think it is x = 4, thats the equation
Mathhelp346
  • Mathhelp346
how did you get that

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anonymous
  • anonymous
y = -8 is a horizontal line, the line is perpendicualr to a vertical line, get it?
Mathhelp346
  • Mathhelp346
yea
anonymous
  • anonymous
so with a vertical line, x will equal one number, in this case, it is 4, always 4 for any y, so its x = 4, did i confuse u?
Mathhelp346
  • Mathhelp346
well how did you get x=4?
anonymous
  • anonymous
it said that it has to contain (4, -1) so that's how I figured that x has to equal 4
anonymous
  • anonymous
Some points of x = 4 are: (4,2)(4,8),(4,-6).......so one....understand?
Mathhelp346
  • Mathhelp346
so you just took the 4 from the pair?
anonymous
  • anonymous
yup, if i included another x-value along with the pair we have, its not going to be perpendicular, that's why
Mathhelp346
  • Mathhelp346
oh ok thanks
anonymous
  • anonymous
yea! Thanks :)

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