Slope of two point : GMAT Quantitative Section
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Slope of two point

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Slope of two point [#permalink]

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New post 14 Mar 2011, 18:05
Quick question, I am midway through the MGMAT geometry book and wanted to know about the slope of two points

MGMAT gives the slope of two points as Y1-Y2/X1-X2 but I always seem to remember it as Y2-Y1/X2-X1 are there any instances where using one or the other would make that much of a difference?
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Re: Slope of two point [#permalink]

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New post 14 Mar 2011, 18:29
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They're both the same!

(y1 - y2)/(x1 - x2) = -(y2 - y1)/-(x2 - x1)

The negative gets cancelled from the numberator and denominator in the RHS (right hand side) of the above equation.

Therefore,

(y1 - y2)/(x1 - x2) = (y2 - y1)/(x2 - x1)

CAUTION:

Do not MIX the order in the numberator and denominator e.g.

(y1 - y2)
_________

(x2 - x1)

IS WRONG :)
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Re: Slope of two point [#permalink]

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New post 14 Mar 2011, 18:31
Entwistle wrote:
They're both the same!

(y1 - y2)/(x1 - x2) = -(y2 - y1)/-(x2 - x1)

The negative gets cancelled from the numberator and denominator in the RHS (right hand side) of the above equation.

Therefore,

(y1 - y2)/(x1 - x2) = (y2 - y1)/(x2 - x1)

CAUTION:

Do not MIX the order in the numberator and denominator e.g.

(y1 - y2)
_________

(x2 - x1)

IS WRONG :)


Thanks I was thinking that, I just wanted to make sure if there was some instance where it did make a difference I couldn't think up. :)
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Last edited by Bigred2008 on 14 Mar 2011, 18:45, edited 1 time in total.
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Re: Slope of two point [#permalink]

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New post 14 Mar 2011, 18:32
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Re: Slope of two point [#permalink]

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New post 21 Mar 2011, 05:39
As long as you're consistent in your application, it doesn't matter if you use (y1-y2)/(x1-x2) or (y2-y1)/(x2-x1)

What you need to be careful of is recognizing that (y1-y2)/(x2-x1) is incorrect.
Re: Slope of two point   [#permalink] 21 Mar 2011, 05:39
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