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Extremely easy math, but need expression

by Joel DB
Tags: expression, extremely, math
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Joel DB
#1
Feb3-14, 10:18 AM
P: 3
Okay,
This could be the easiest math question on here... but I'm going to ask the dumb question anyway. I have several coordinate points to solve for, and in each case I subtract the same amount from the previous "x" to get the next "x" value (X2...3...4...5...). The only point where I subract a different value is X1. The rest have a constant rate of change (derivative?). Example:

1.) X1 = (some vaule) 30
2.) X2 = (X1 60), X3 = (X2 60), X4 = (X3 60), X5 = (X4 60), X6 = (X5 60)

There has to be a simple mathematical formula, other than this sloppy one. Any help would be great.
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Mark44
#2
Feb3-14, 11:48 AM
Mentor
P: 21,283
See http://en.wikipedia.org/wiki/Arithmetic_progression.
rama
#3
Mar13-14, 06:15 AM
P: 9
like Mark44 said this is an arithmetic progression
Here the difference between two terms(of the sequence) is equal
Tn=a+(n-1)d
where a is the first term and d is the difference between two terms(d=T2-T1)


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