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# vertical line test watch

1. is it just the test graphically to see if a whatever is drawn on the graph is a function or not?
2. (Original post by will'o'wisp2)
is it just the test graphically to see if a whatever is drawn on the graph is a function or not?
Essentially. It's to check that it's one to one (meaning it's a function). This occurs when each value in the domain maps to only one value in the range.
3. (Original post by will'o'wisp2)
is it just the test graphically to see if a whatever is drawn on the graph is a function or not?
Searching Google for "vertical line test" led me to Wikipedia: https://en.wikipedia.org/wiki/Vertical_line_test

"In mathematics, the vertical line test is a visual way to determine if a curve is a graph of a function or not."
4. (Original post by NotNotBatman)
Essentially. It's to check that it's one to one (meaning it's a function). This occurs when each value in the domain maps to only one value in the range.
(Original post by President Snow)
Searching Google for "vertical line test" led me to Wikipedia: https://en.wikipedia.org/wiki/Vertical_line_test

"In mathematics, the vertical line test is a visual way to determine if a curve is a graph of a function or not."
A function can only have one output, y, for each unique input, x.

This was also in the search when i used google so does that mean that for example a many to 1 "function" isn't a function?

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