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Because x has historically been used to describe "the unknown" and that's exactly what an independent variable is, an unknown. y was used because it follows x.

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What is the variables in x23 plus 6-y?

The variables are x and y


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The joint probability function for two variables is a probability function whose domain is a subset of two dimensional space. The joint probability function for discrete random variables X and Y is given aspr(x, y) = pr(X = x and Y = y). If X and Y are independent random variables then this will equal pr(X =x)*pr(Y = y).For continuous variables, the joint funtion is defined analogously:f(x, y) = pr(X < x and Y < y).


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Given two variables, X and Y, the rate of X relative to Y is X/Y.


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temp = x; x = y; y = temp;


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