I posted this question myself to be honest because i wasn't sure...
but the horizontal line test was made to prove whether the function/graph was an one-to-one function
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there is no horizontal-line test for functions, because people do not do the test that is why !!!
A horizontal line.A horizontal line.A horizontal line.A horizontal line.
true
yes _________ there is a horizontal line for ya!
The horizontal line is called the horizontal axis