SOLUTION: Is there an instance when a linear equation is not a function?

Question 253774: Is there an instance when a linear equation is not a function?
Found 2 solutions by MRperkins, richwmiller:
Answer by MRperkins(300) (Show Source): You can put this solution on YOUR website!
are vertical lines linear? Are they functions? How would you write the equation for a vertical line?
email me at justin.sheppard.tech@hotmail.com
I will be happy to discuss this with you
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
A function associates each element in the domain with exactly one element in the codomain which means that for each x there is only one y.
Let's look at the vertical line with one x but many y's
x=3
The slope is undefined since x never changes. So the denominator is 0.

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