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Topic: Distance formula
Replies: 6   Last Post: Apr 6, 2005 8:26 AM

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Ed Wall

Posts: 845
Registered: 12/3/04
Re: Distance formula
Posted: Apr 4, 2005 11:29 AM
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How are you using the distance formula for finding the distance
between a point and a line?

Ed Wall

At 12:39 PM +0000 4/4/05, Moriel wrote:
>I know how to use the distance formula most of the time, for finding
>the distance between a point and a line, but there are certain
>instances where I get stuck. For example: here's the problem I'm
>trying to do right now. "Find the distance from the point (4, -1) to
>the line x + y = 5." Okay, that's not hard, but what I end up with
>for two equations are y = -x + 5 and then y = 1/x - 5/4, which would
>be okay again, but when I set those equal to each other I have -x +
>5 = 1/x - 5/4, and the stupid problem is I don't know how to add x
>and 1/x. If it were anything else--x and 1/2x, or whatever--I'd be
>fine, but I keep getting stuck on this.

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