Mathhelp346
Write an equation that contains the given point and is perpendicular to the given line:
(4,1), y=8



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Mathhelp346
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I tried \[yy _{1}=m(xx _{1})\] but i would always get a value for y which isnt right

tejasree
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I think it is x = 4, thats the equation

Mathhelp346
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how did you get that

tejasree
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y = 8 is a horizontal line, the line is perpendicualr to a vertical line, get it?

Mathhelp346
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yea

tejasree
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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
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well how did you get x=4?

tejasree
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it said that it has to contain (4, 1) so that's how I figured that x has to equal 4

tejasree
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Some points of x = 4 are: (4,2)(4,8),(4,6).......so one....understand?

Mathhelp346
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so you just took the 4 from the pair?

tejasree
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yup, if i included another xvalue along with the pair we have, its not going to be perpendicular, that's why

Mathhelp346
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oh ok thanks

tejasree
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yea! Thanks :)