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Math Help - find the angle

  1. #1
    Junior Member
    Joined
    Sep 2007
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    29

    find the angle

    find the angle for the line

    3x-15y+7

    do i divid them all by -15 so that i get y alone?

    -0.2x+y-0.46

    y=-0.2x-0.46

    this seems wrong somehow
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  2. #2
    MHF Contributor red_dog's Avatar
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    Medgidia, Romania
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    The line has an equation, not an expression.
    3x-15y+7=0\Rightarrow y=\frac{1}{5}x+\frac{7}{15}.
    The slope is m=\frac{1}{5}.
    On the other hand, the slope is the tangent of the angle between the line and the positive x-axis.
    So, m=\tan\alpha=\frac{1}{5}\Rightarrow\alpha=\arctan\  frac{1}{5}.
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