To replace a number in an equation
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A and C are both variables.
Letters used in math are called variables.
In math, the purpose of Cramer's rule is to be able to find the solution of a system of linear equations by using determinants and matrices. Cramer's rule makes it easy to find a system of equations that have many unknown variables.
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Independent variables are the input value of a function (usually x) and dependent variables are the output value of the function (usually y).