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Math Help - Help With Project

  1. #1
    Newbie
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    Apr 2011
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    Help With Project

    Very lost with a project in math class.
    Need to find out and show work to see of this system is parallel, perpendicular or neither?

    x-3y=-5
    y=3x-9

    Any Help on how to find this out?
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  2. #2
    MHF Contributor Unknown008's Avatar
    Joined
    May 2010
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    You should know that an equation in the form y = mx + c (or y = ax + b)

    has the gradient as m and y-intercept as c.

    If the gradient of the two lines are the same, then they are parallel.
    If their product gives -1, it means they are perpendicular.
    If they are neither the same, nor their product gives -1, then they are neither parallel nor perpendicular.
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