A variable, Y, is in direct square variation with a variable, X, if Y = kX2 where k is some (non-zero) constant.
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direct square variation is a function that relates the same or equal constant ratio. It is a function that is typically used in different kinds of algebra.
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Direct variation is not a special case.
If a variable X is in inverse variation with a variable Y, then it is in direct variation with the variable (1/Y).
When two variables are related in such a way that the ratio of their values always remains the same, the two variables are said to be in direct variation. y=2x is direct variation y=x+2 is not direct variation