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    There is a mistake in the question. You can see just by looking at the points that one has a negative gradient and the other a positive gradient.
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    (Original post by bull3tkid-ark)
    The line r passes through the points (-3,0) and (3,-2) and the line s passes through (5,-3) and (20,9). Show that the lines r and s are parallel.

    Is this a trick question? I plotted them both and they looked nowhere near parallel! I also worked out there gradients and they were not the same :s

    help please, STEP BY STEP!
    thanks :]
    Ignore that
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    Oh right there's a mistake... hmmm check it.
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    (Original post by Dededex)
    You could do a variety of things to prove that they are parallel.

    Personally, I would find the midpoints of each set of coordinates, so for the first one you have:

    (\frac{-3+3}{2},\frac{0-2}{2})

    You know where to go from there I presume?
    I am losing the will to live today.
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    (Original post by bull3tkid-ark)
    there's 2 questions in a row that don't make sense xDxD
    The other one:
    The line l passes through the points (4,4) and (-1,-6) and the line n passes through the points (1,8) and (-1,2). Show that the lines l and n are perpendicular.
    There's a mistake in this question too. Where did you get these questions from?
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    (Original post by bull3tkid-ark)
    there's 2 questions in a row that don't make sense xDxD
    The other one:
    The line l passes through the points (4,4) and (-1,-6) and the line n passes through the points (1,8) and (-1,2). Show that the lines l and n are perpendicular.
    Wrong too.
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    (Original post by Mr M)
    I am losing the will to live today.
    What? Don't expect me to pick up on mistakes straight away... Ok ok I made a mistake I know but seriously...
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    (Original post by Dededex)
    What? Don't expect me to pick up on mistakes straight away... Ok ok I made a mistake I know but seriously...
    I genuinely don't know where you were thinking with your suggestion. How would finding the midpoints of two line segments help someone prove they are parallel?
 
 
 
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