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### #1BlackHwk4  Members

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Posted 12 October 2001 - 11:57 AM

I started teaching myself about physics a couple of days ago and I have a couple of questions. The tutorial I was reading was about graphs in 1D kinematics. Here is the equation I have questions about:

What do those triangles stand for? And the 2 and 1 beside the y''s and x''s, does that mean I subtract the right point from the left point? Thanks for any help.

### #2b00ny  Members

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Posted 12 October 2001 - 12:08 PM

The triangle is the Greek letter Delta, and in this context is used to mean "Difference". i.e "slope equals difference in Y divded by difference in X"

The 1s and 2s are indicating the first and second point, i.e. If you have a line running from point (x1,y1) to (x2,y2). The formula then gives you the gradient (slope) of that line.

### #3BlackHwk4  Members

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Posted 12 October 2001 - 02:44 PM

Thanks for the help. Everything makes sense now.

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