If two variable, X and Y are in direct variation, then the proportion of X/Y or Y/X has a constant value.
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k=0.3 and x=65
Inverse Direct Joint
Both are variations of certain kinds of equations. X=kY is a direct variation since X varies directly as Y and k is the constant of variation. X=k/Y is an inverse variation where X varies inversly as Y and k is the constant of variation. Both of these variations are also functions.
proportions are used in scale factors; scale factors ARE proportions
Proportions of differing proportionality