SOLUTION: how do i know if a line is a function or not?

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Question 720195: how do i know if a line is a function or not?
Found 2 solutions by MathLover1, lynnlo:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
The Vertical Line Test-if you have a function, than vertical lines hit the graph once
The vertical Line test is a way to determine whether or not a relation is a function. The vertical line test simply states that if a vertical line intersects the relation's graph in more than one place, then the relation is a NOT a function.
The vertical line test is simply a restatement of the the definition of a function which states that every x value must have a unique y value.
If any particular x value has more than one y value, then you can pass a vertical line will intersect with the graph of the relation more than once.


Answer by lynnlo(4176) About Me  (Show Source):
You can put this solution on YOUR website!
YOU CAN IDENTIFY BY ALL FUNCTIONS MUST HAVE AN X and Y VALUE