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A function means that the independent variable has only one dependent value associated with it.
In other words, for F(x)=4x:
x is the independent variable
F(x) is the dependent variable.
So, for a given x, there is one and only one value of F(x).
Does this help?
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Mike Bradshaw
1980 911SC sunroof coupe, silver/black
Putting the sick back into sycophant!
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