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Math Help - Parallel and perpendicular lines?

  1. #1
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    Parallel and perpendicular lines?

    Write an equation of the line through the point that is parallel to the given line and perpendicular.


    Point (7/8,3/4) line 5x+3y=0

    which I turned into y=-5/3x

    Then I plug into

    (y-3/4)= -5/3(x-7/8) This is for parallel

    3(3/4)=-5(x-7/8) Did I set this up correct


    My second question is

    (2,5) x=4 how would I set it up if the slope is undefined?
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  2. #2
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    Re: Parallel and perpendicular lines?

    Quote Originally Posted by homeylova223 View Post
    Write an equation of the line through the point that is parallel to the given line and perpendicular.
    (2,5) x=4
    Given the line x=4 and point (2,5)
    one answer is y=5 and the other is x=2.
    Which is which?
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  3. #3
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    Re: Parallel and perpendicular lines?

    Hmm I guess x=2 would be the parallel and y=5 perpendicular
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    Re: Parallel and perpendicular lines?

    Quote Originally Posted by homeylova223 View Post
    Hmm I guess x=2 would be the parallel and y=5 perpendicular
    Correct.
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    Re: Parallel and perpendicular lines?

    Would this be parallel for my first question

    3(y-3/4)=-5(x-7/8)

    3y-2.25=-5x+4.375
    3y=-5x+6.625

    y=-5/3x+6.625/3 ?
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    Re: Parallel and perpendicular lines?

    Quote Originally Posted by homeylova223 View Post
    Write an equation of the line through the point that is parallel to the given line and perpendicular.


    Point (7/8,3/4) line 5x+3y=0

    which I turned into y=-5/3x

    Then I plug into

    (y-3/4)= -5/3(x-7/8) This is for parallel

    3(3/4)=-5(x-7/8) Did I set this up correct

    [snip]
    Yes.
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