Re: Lines, points and planes
From: Cassandra Thompson (newsgroups_at_calebsoftware.com)
Date: 12/06/04
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Date: Mon, 06 Dec 2004 00:28:31 GMT
matt wrote:
> Cassandra Thompson <newsgroups@calebsoftware.com> wrote in message news:<GuCsd.60011$K7.24555@news-server.bigpond.net.au>...
>
>>Aah, too tired to explain too much. I have answered the following
>>question but fear I am very incorrect.
>>
>>Q) Find the equation of the plane that passes through the origin and is
>>perpendicular to (x, y, z) = (1, 0, -2) + t(3, 1, -1)
>>
>>A)
>>Line L is defined by (x, y, z ) = (1, 0, -2) + t(3, 1, -1), t any real
>>number.
>>v = 3i + j - k
>>Q1 = (0, 0, 0)
>>
>>a(x ? x0) + b(y ? y0) + c(z ? z0) = 0
>>3(x ? 0) + 1(y ? 0) ? 1(z ? 0) = 0
>>3x + y ? z = 0
>>
>>Therefore the equation of the plane is 3x + y ? z = 0.
>>
>>
>>I was quite confident that it was correct. Except ...
>
>
> Omigod. Google turned some of your minus signs into ?s when I went
> into preview mode. Why, I don't know. (You didn't use some weird
> character like a dash instead of an ASCII hyphen did you?)
>
I am typing my assignment in MS Word, I copied the above workings
straight from word. Yes, it would have been dashes not minus signs as I
notice that MS Word does alot of auto-correcting with regard to
minus-signs/dashes.
Sorry about that.
Cassandra.
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