there is no graph...
but most chance it's all real numbers
If a vertical line, within the domain of the function, intersects the graph in more than one points, it is not a function.
It means that the function is not defined for a part of the domain.
In mathematics, the domain refers to the set of all possible input values (or arguments) for a given function. It defines the values that can be used in the function without causing any undefined situations, such as division by zero or taking the square root of a negative number. The domain can be represented using interval notation, set notation, or a graph, depending on the context.
A linear function would be represented by a straight line graph, so if it's not a straight line, it's nonlinear
No vertical line will intersect the graph in more than one point. The fundamental flaw is that no graph can show that it does not happen beyond the domain of the graph.
Reciprocal parent function
points
point
money
mad
point
mad
The practical domain is the domain by simply looking at the function. Whereas the mathematical domain is the domain based on the graph.
Graph each "piece" of the function separately, on the given domain.
A function must have a value for any given domain. For each edge (or interval), the sign graph has a sign (+ or -) . So, it is a function.
If a vertical line, within the domain of the function, intersects the graph in more than one points, it is not a function.
If a vertical line, within the domain of the function, intersects the graph in more than one points, it is not a function.