Question

Why is y=x^2 a function, while x=y^2 is not a function? Give a graphical and an algebraic explanation.

Answer 1

Function definition (Formal way) is A function relates each element of a set with exactly one element of another set (possibly the same set).

Read this URL and you have your answer more clearly

http://www.mathsisfun.com/sets/function.html

Answer 2

Thank you

Answer 3

x =y^2 doesn't past vertical test for being a function.