"Y" is the dependent variable and "X" is the independent variable. This means that the value of "Y" is determined specifically by a function when applied to the value of "X", which can be any number.
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X percent of y is y percent of X See related link.
x exceeds y by one
If two variable, X and Y are in direct variation, then the proportion of X/Y or Y/X has a constant value.
That depends on how "x" and "y" are related. For example, if you happen to know that there is a linear relationship, you can use the rule of three to calculate the missing value. But if you don't know how "x" and "y" are related, it can be ANYTHING.
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