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# Slope of two point

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Current Student
Joined: 10 Aug 2009
Posts: 67
Location: United States (AL)
Concentration: Entrepreneurship, Strategy
GMAT 1: 600 Q43 V30
GMAT 2: 640 Q41 V36
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Kudos [?]: 30 [0], given: 45

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14 Mar 2011, 19:05
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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Location: India
Schools: Haas '18, Kelley '18
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Kudos [?]: 202 [1] , given: 78

Re: Slope of two point [#permalink]

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14 Mar 2011, 19:29
1
KUDOS
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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Current Student
Joined: 10 Aug 2009
Posts: 67
Location: United States (AL)
Concentration: Entrepreneurship, Strategy
GMAT 1: 600 Q43 V30
GMAT 2: 640 Q41 V36
Followers: 0

Kudos [?]: 30 [0], given: 45

Re: Slope of two point [#permalink]

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14 Mar 2011, 19:31
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.
_________________

"Popular opinion is the greatest lie in the world"-Thomas Carlyle

Last edited by Bigred2008 on 14 Mar 2011, 19:45, edited 1 time in total.
Director
Status: -=Given to Fly=-
Joined: 04 Jan 2011
Posts: 834
Location: India
Schools: Haas '18, Kelley '18
GMAT 1: 650 Q44 V37
GMAT 2: 710 Q48 V40
GMAT 3: 750 Q51 V40
GPA: 3.5
WE: Education (Education)
Followers: 50

Kudos [?]: 202 [0], given: 78

Re: Slope of two point [#permalink]

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14 Mar 2011, 19:32
Senior Manager
Joined: 17 Mar 2011
Posts: 452
Location: United States (DC)
Concentration: General Management, Technology
GMAT 1: 760 Q49 V45
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Kudos [?]: 181 [0], given: 5

Re: Slope of two point [#permalink]

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21 Mar 2011, 06:39
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, 06:39
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