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Maybe this question has possible duplicate or something, but i still don't get it.

Suppose i have this function :

$$f(x,y)=x+y$$

What is the inverse of this? Is it possible? Bcz, i'm not learning the inverse of multivariable function on calculus.

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Assume that your function is $$f:\mathbb R^2 \to \mathbb R$$ Since $f(1,-1)=f(2,-2)=0$ your function is not injective and therefore it does not have an inverse.

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