No. One argument of function may have only one value. So, if it has more than one value, it is not a function.
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the graph is called a line
Horizonatal line test is a test use to determine if a function is one-to-one. If a horizontal line intersects a function's graph more than once, then the function is not one-to-one. A one-to-one function is a function where every element of the range correspons to exactly one element of the domain. Vertical line test is a test used to determine if a function is a function or relation. If you can put a vertical line through graph and it only hits the graph once, then it is a function. If it hits more than once, then it is a relation.
Yes the graph of a function can be a vertical or a horizontal line
A graph is a function if any vertical line intersects it at most once.
A linear function