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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The variables are x and y
It is a linear equation in the variables x and y.
Given two variables, X and Y, the rate of X relative to Y is X/Y.
Y = 2X Variables are X and Y If X = 2, then Y = 4 If X = 3, then Y = 6 and so forth. If you vary one then he other changes. Their values are variable.
Variables are symbols that replace unknown numbers. Variables are often letters. For example: 5*x=10 7*6=y Here "x" and "y" are the variables.