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Because there are two unknown variables.
Variables change, constants do not.
When you multiply two variables with different exponents, the exponents are added. For example, if you multiply x^2 by x^3, the result is x^(2+3) = x^5. Similarly, if you multiply x^3 by x^(-2), the result is x^(3+(-2)) = x^1 = x.
well it is something that varies but is also able
Factorial designs