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BarlowGirl
 2 years ago
PLEASE HELP!!!!!! URGENT!!!!
When there's a table of information, for two different variables (like f(x) and x), how do I find the constant ratio to determine if it's an exponential function?
Thank you SO much!  I really appreciate the help! =)
BarlowGirl
 2 years ago
PLEASE HELP!!!!!! URGENT!!!! When there's a table of information, for two different variables (like f(x) and x), how do I find the constant ratio to determine if it's an exponential function? Thank you SO much!  I really appreciate the help! =)

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jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1Do you have a table to use as an example?

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1If not, I can make one up if you want.

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.0Sure, let me give an example . . . .

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.0dw:1338949389152:dw

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.0Note: I made this up, so it most definitely won't have a constant ratio.

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1If this was an exponential equation, then it would be of the form y = a*b^x where a and b are some constant numbers

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1When x = 1, y is y = 1. So y = a*b^x 1 = a*b^1 1 = a*b Now solve for b to get b = 1/a

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1When x = 6, y is y = 5 So y = a*b^x 5 = a*b^6 Now plug in b = 1/a to get 5 = a*(1/a)^6 5 = a/(a^6) 5 = 1/a^5 5a^5 = 1 a^5 = 1/5 a = fifth root of 1/5 a = 0.72477 Since b = 1/a, we know that b = 1/a b = 1/0.72477 b = 1.3797 Therefore, if this was an exponential equation (it's probably not, but let's say it is), then the equation would be approximately y = 0.72477*1.3797^x

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.0Okay, I'm following.

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1Now let's test another ordered pair. Let's test (8,4). Plug in x = 8 and y = 4 to get y = 0.72477*1.3797^x 4 = 0.72477*1.3797^4 4 = 0.72477*3.62358670182697 4 = 2.62626693388313 and we're way off So because of this, the table above is NOT modelling an exponential function

BarlowGirl
 2 years ago
Best ResponseYou've already chosen the best response.0Okay, I think I understand. Thank you very much  you've been so helpful! :)

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.1you're welcome, I'm glad I could help
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