Posted by **y912f** on Thursday, November 13, 2008 at 7:28pm.

can you please help me understand relations and functions.

Like how to figure out if an equation is a function or not a funcion.

for example:

1) 3x+2y=6,

2) x=y^2+2

and

3) y=square root of 1-x

thank you

- trigonometry (not) -
**drwls**, Thursday, November 13, 2008 at 8:04pm
The equation in 1, after rearranging, can be considered y as a function of x or x as a function of y.

2. expresses x as a function of y and

3. expresses y as a function of x.

I would say that they are all functions, but your teacher may have other ideas.

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