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It is a formula that is the reverse of another one.

I.e if you put x = 1 into a formula and get y = 5, with the inverse formula you would put x =5 and get y = 1.

To work out an inverse I will give an example:

Y = 2X + 7

there are 2 ways to do it, but my favourite is to replace ys with xs and vice versa so:

X = 2Y + 7

rearrange to get it as Y =...

2Y = X - 7

Y = (X-7)/2

Now put in a number like x = 5 into the top equation and you get y = 17 then putting x = 17 into the bottom equation you get 5, which means it is correct, the inverse.

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Q: What is an inverse formula?
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