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Math Help - Angles between lines

  1. #1
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    Post Angles between lines

    Find the angle between x=2+3t, y= -1-t and x+3y=0
    Been having trouble with this one, part of extra work.
    thanks for the help
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    Quote Originally Posted by monkius View Post
    Find the angle between x=2+3t, y= -1-t and x+3y=0
    Been having trouble with this one, part of extra work.
    thanks for the help
    solving the y equaiton for t you get

    y=-1-t \iff t=-1-y then sub this into the equation for y to get

    x=2+3(-1-y) \iff x=-1-3y

    try putting both equations into standard form and what do you notice?

    Good luck.
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