Gustavs1337 said:Homework Statement
there's a table x - 1;2;3;u;u;u;u;8
y - 370;160;90;u;24;u;u;u u - unknown value
i have to complete this table with this equation y=(k/x)+b you have to find k and b values
Homework Equations
y=(k/x)+b x is relevant to y x -1 is y -370 and x-2 is y-160 and so on
The Attempt at a Solution
I have tried doing this witha calculator adding all kinds of numbers but with no progress :(.
the ones in y are different, but i believe that the ones in x might be the same, because 1;2;3 right and the last is 8 not any other number. oh and yea i guess its exact fit if yu mean like 2 or 3 not 2,5 or 3,5Ray Vickson said:Are the 4 u-values in x all the same---a single unknown number---or are they 4 unknown numbers? Are the 3 u-values in y the same or different? Are the u's for x the same or different from the u's for y? Do you want an exact fit, or do you want a "best" fit, such a least-squares fit or something similar?
What makes you think x is 5 there?Gustavs1337 said:I just figured out something but I am not sure, if k is 420 and b is -50 then it goes correctly by the table but it gets wrong at the 24, because 420/5 -50 is 34 not 24. Can it be a mistake in the table or is there smth I am mistaken in ?
Well its mostly because the x-8 is in the end so i thought that the missing x'es were [4;7], but now i think it might not be true because the results don't match. I don't want to believe that there's a mistake in the table tho. I also thought that why are the x'es unknown if it were from 1 to 8, so i think there is some kind of secret or something that i do not knowharuspex said:What makes you think x is 5 there?
Just drop the assumption that the missing x values are in arithmetic progression. The first three entries in the table are enough to find k and b. Thereafter it is just a matter of calculating the unknown number (x or y) from the known one.Gustavs1337 said:Well its mostly because the x-8 is in the end so i thought that the missing x'es were [4;7], but now i think it might not be true because the results don't match. I don't want to believe that there's a mistake in the table tho. I also thought that why are the x'es unknown if it were from 1 to 8, so i think there is some kind of secret or something that i do not know
haruspex said:Just drop the assumption that the missing x values are in arithmetic progression. The first three entries in the table are enough to find k and b. Thereafter it is just a matter of calculating the unknown number (x or y) from the known one.
By the way, the easiest way to find k and b is to consider the product xy. This should equal k+bx, so you can do a straight line fit.
Yes.Gustavs1337 said:do you mean xy=k+bx
Yes.Gustavs1337 said:do you think the number 24 fits in the table
haruspex said:Just drop the assumption that the missing x values are in arithmetic progression. The first three entries in the table are enough to find k and b. Thereafter it is just a matter of calculating the unknown number (x or y) from the known one.
By the way, the easiest way to find k and b is to consider the product xy. This should equal k+bx, so you can do a straight line fit.
so, by my calculations x5 = 5.68 ?haruspex said:Yes.
Yes.
Yes.Gustavs1337 said:so, by my calculations x5 = 5.68 ?
Well that's close. ##\ \frac{210}{37}=5\frac{25}{37}\ .##Gustavs1337 said:so, by my calculations x5 = 5.68 ?