Question

what is a function

Answer 1

or x=2y2 is function or not

Answer 2

A function is an equation (this is where most definitions use one of the words given above) for which any x that can be plugged into the equation will yield exactly one y out of the equation. *From Paul's Online Notes

By this definition \[x = 2y ^{2}\]
is not a function as it has two y values for some x values

Answer 3

One way to check if something is a function is to graph it. If you can draw a vertical line that passes through two or more points then what you have is not a function.

Answer 4

ok the function means it should be balanced

Answer 5

It isn't a function. algebraic expression with at least 2 variables is a function.

Answer 6

The important thing to remember for something to be a function is that you have one, and only one, output (y-value) for any given input (x-value).