Question

how do you write an equation given a graph?

Answer 1

This very much depends on the graph. If theyre linear, then its simple. Otherwise, depending on the complexity there are a number of equations you can use to get an APROXIMATE equation.

Is the graph you have in mind linear?

Answer 2

no it is not

Answer 3

What kind of graph is it? Some particular cases may be done nicely.

Answer 4

honestly...i really have nothing in mind...is there no general way??

Answer 5

you may find values of heights for given values of x using the graph..
but as the degree of the function gets higher..lesser the probability one can find the eqn of the graph..

Answer 6

No. You have to use computational mathematics. Try simpsons method. Theres quite a few number of methods. Like Eulers method, least squares method, etc.

Some have a greater degree of approximation than others, at the cost of ever increasing ammounts of complexity.

Answer 7

Computational mathematics is more often refered to as numeric analisys, actually.

Answer 8

sorry i was afk. what were we talking about again?

Answer 9

The jist of it: to get the function of ANY graph you must use numeric analisys. And most functions can only be approximated to.

Answer 10

uhmm no numerical analysis..just plain algebra..

Answer 11

If youre in college and are taking linear algebra then youve sure come accross the least squares method, yes?

Answer 12

assuming im not in college nor have taken linear algebra

Answer 13

well, then you should probably just wait. either that or google it up! its not that complicated :)

Answer 14

so there's no simple algebra way?

Answer 15

or maybe calculus?

Answer 16

Nope. You need the numerical analysis. Which in turn needs calculus.

If youre really interested, you can read on the least squares.
http://en.wikipedia.org/wiki/Least_squares

Then there are other methods, simpler, that predict how a function will grow without even knowing it. All you need is knowledge of their derivatives.

Its all cool stuff, but you gotta wait for it.

Answer 17

i really hate numerical analysis lol