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Basic question on Coordinate Geometry

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by crackgmat007 » Thu Oct 29, 2009 12:47 pm
I have a very basic question with regard to the below formula for slope:

y2 - y1
-------
x2 - x1

My question is how do you determine which one is y2 & y1?

Lets say (0,-3) & (4,-5). Is y2 - 5 or -3?

Lets take another example, (8,0) & (4,-5). Which one is y2 in this case?

Pls clarify.
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Source: — Quantitative Reasoning |
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by okigbo » Thu Oct 29, 2009 12:58 pm
Doesn't matter as long as you remain consistent with x and y
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by crackgmat007 » Thu Oct 29, 2009 1:44 pm
okigbo wrote:Doesn't matter as long as you remain consistent with x and y
Oh.. :D such a simple solution.
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