My Math Forum formula for direct or inverse related values

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 September 18th, 2016, 07:17 AM #1 Member   Joined: Nov 2012 From: The Netherlands Posts: 40 Thanks: 2 formula for direct or inverse related values Hello All via the following x, y values , a formula needs to be decided for the 'Y ' variable. Basicaaly Consider the table below for x and y (are they directly proportional or are they inversely related ? ). and also to find out the corresponding formula. Pl. see the image http://s6.postimg.org/nph5u40dd/math.png I have seemed to find the answer BUT with trial and error for e.g ( 4,11 :--> 4 X 2 = 8 +3) say this is 'Try 1' for ( 12,31 :---> 12 X 2 = 24 +7) and so on also in the (8+3) above , take the '3' & in (24+7) above take the '7' , which gives a pattern of 'multiply with 2' +1 (notice the '1') and when I would repeat the above once again but this time with for e.g ( 4,11 :---> 4 X 3 = 12) say this is 'Try 2' then I just take the (a gamble) of 'Try 1' and 'Try 2' and can settle for 2.5 as the factor so y = 2.5x + 1 is the formula but is there a 'proper' way to get the formula( other than guesswork and a not structural method like I have done above) ? Thanks in advance
 September 18th, 2016, 07:24 AM #2 Member   Joined: Nov 2012 From: The Netherlands Posts: 40 Thanks: 2 for some reasons I seem to have posted the issue twice here. that was not the intention. Moderator pl. delete this issue as it is a duplicate. Thank you

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