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Formula fit based on 2 parameters

Lets say I got 1 result and many system parameters

I want to find the dependency of the result on the system parameters,
I know how to do it, if the dependancy is on one parameter (Multivariate chart)
But how can I do it if the dependancy is on 2 parameters?
For example Z = X*Y - I will not see correlation between Z and X or Z and Y ...

Hope the question is chear,
Thanks.