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I have got a very basic Math query here and hope people will not get turned off with the nature of this simple query.

My query goes like this:

variable X makes jump by factor +4.

at the same time, Y makes a jump by factor +2

in coordinate terms, I would have a series like :

(4,2) (8,4) (12, 6) (16,8) (20,10)....and so on

I would like to know the generic formula for calculting this coordinate series...for example,if Y is (say) 2867544 , then what should be X ? ( also vice versa )

can anyone tell me a formula for this please

...and hope the question was clear .

Thanks

Rick