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Bigred2008
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14 Mar 2011, 19:05
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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?
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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14 Mar 2011, 19:29
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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
(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
Bigred2008
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Location: United States (VA)
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Schools: Darden '17 (M$)
WE:Business Development (Other)
Products:
Updated on: 14 Mar 2011, 19:45
Originally posted by Bigred2008 on 14 Mar 2011, 19:31.
Last edited by Bigred2008 on 14 Mar 2011, 19:45, edited 1 time in total.
Last edited by Bigred2008 on 14 Mar 2011, 19:45, edited 1 time in total.
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Entwistle
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.
