## The problem

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How do I input for function

Determine whether each relation defines y as a function of x

## Answer provided by our tutors

General functional notation (e.g. *f(x)* ) is not supported. If you wish to draw a function such as *f(x) = x^2*, replace *f(x)* with *y *(or any other unused variable).

How do you define the function depends on the conditions given in the problem.

Test different values of x, and determine:

Does every value of x correspond to exactly one value of y? If the answer is yes, then y is a function of x. If the answer is no, then y isn’t a function of x.

You can also graph and see (click here to see the graph).

If it is not possible to draw a vertical line to touch/intersect the graph in more than one place, then y is a function of x.