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 Post subject: Normal lines.Posted: Mon, 27 Feb 2012 17:32:23 UTC
 Senior Member

Joined: Sun, 25 Dec 2011 00:28:25 UTC
Posts: 95
Hello.

I have a problem solving a task, which I've done some others similar not long time ago. But I need some help here...

Attempted:

Now here's the problem, if I want to take k which in this case should be: the denominator of fraction contains letter m
Which one we need to calculate the value of m, anyway, my other similar tasks I had before, always was like... a line at one point... example:

Point normal with line So I just used:

But in this case I don't have any point, I don't know what should I do, any help would be great, Thank you. (Sorry for my bad english )

The multiple choices are:

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 Post subject: Re: Normal lines.Posted: Mon, 27 Feb 2012 18:56:29 UTC
 Member of the 'S.O.S. Math' Hall of Fame

Joined: Mon, 23 Jun 2003 17:34:53 UTC
Posts: 2084
Location: San Antonio,Texas USA
The slope needs to be -1.

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 Post subject: Re: Normal lines.Posted: Mon, 27 Feb 2012 20:47:17 UTC
 Senior Member

Joined: Sun, 25 Dec 2011 00:28:25 UTC
Posts: 95
royhaas wrote:
The slope needs to be -1.

How do you mean -1 ?

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 Post subject: Re: Normal lines.Posted: Mon, 27 Feb 2012 21:11:20 UTC
 Senior Member

Joined: Sun, 25 Dec 2011 00:28:25 UTC
Posts: 95
Evaluating the problem I think I just found something...

From lines:

Therefore:

Let's be sure...

We have:

Substituting we get:

Getting the lines:

We have:

True...or not??

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