What formula had to be used to get X from the given graph?

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#1

Recently, I was writing code when I started thinking about how to define X from this graph.
I tried using proportions, but it’s not the same because in this case the “first number” decreases, not increases.

Graph defining X
Graph defining X768×512 21.6 KB

Here is the second chart where I marked the X:

Graph defining X2
Graph defining X2768×512 24.6 KB

What formula had to be used to substitute any number for the second variable and I would get X?
I have tried all the formulas known to me so far, but my mathematical knowledge is not that big.
I also looked for information on Roblox Creator Documentary, but found nothing there either.
Any ideas?

#2

Well, how is the graph defined? Do you have a function describing the line?

#3

This is middle school stuff, are you sure you don’t know? A linear equation?

--if
y = mx + b
--then
x = (y - b)/m
#4

It’s not linear, look at the Y scale. It’s just being tricky.

#5

then i guess use newton iteration to solve equations if you don’t know what type they are

This module has an algorithm that does just that

1 Like
#6

So I came up with a super stupid idea that works.
I simply subtracted X from 100 and then by proportion counted the number
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However, thanks for the help of users @JarodOfOrbiter , @Prototrode and @nicemike40

#7

Can’t you just do 1 / (Second Number) to get X (“First Number”)?

Also just for future reference, usually “x” refers to the horizontal axis, not the vertical axis.

#8

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