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Math Help - Perpendicular linear equations.

  1. #1
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    Perpendicular linear equations.

    How would you solve...
    In the xy-plane, the graph of which of the following linear equations is perpendicular to the graph of the linear equation 3x-4y=0?
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  2. #2
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    Quote Originally Posted by dnntau View Post
    How would you solve...
    In the xy-plane, the graph of which of the following linear equations is perpendicular to the graph of the linear equation 3x-4y=0?
    What lines?
    Any line perpendicular to the given line looks like:
    4x+3y=K.
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  3. #3
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    Oh. Sorry.

    A) y= -4/3x + 12
    B) y= -3/4x + 12
    C) y= 3/4x + 12
    D) y= 4/3x + 12

    I don't know how to find a perpendicular line and when I tried it on a graphing calculator I got it wrong. They say the answer is A but I didn't know how they got that.
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  4. #4
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    Quote Originally Posted by dnntau View Post
    Oh. Sorry.

    A) y= -4/3x + 12
    B) y= -3/4x + 12
    C) y= 3/4x + 12
    D) y= 4/3x + 12

    I don't know how to find a perpendicular line and when I tried it on a graphing calculator I got it wrong. They say the answer is A but I didn't know how they got that.
    Put the answer I gave into the slope-intercept form. You will see it.
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  5. #5
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    Alrighty. I see it now.
    Thanks so much.
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