SOLUTION: what is the differences of function to relation?

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Question 41774: what is the differences of function to relation?
Answer by psbhowmick(878) About Me  (Show Source):
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If x and y are in variation then their relationship is not a function. A function involving x and y has to be a mathematical relation, but, a mathematical relation need not be a function e.g. variation.

For detailed information regarding function, see my lesson Introduction to Functions at

http://www.algebra.com/tutors/lessons-by-tutor.mpl?tutor=psbhowmick