The "vertical line test" will tell you if it is a function or not. The graph is not a function if it is possible to draw a vertical line through two points.
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When you graph a tangent function, the asymptotes represent x values 90 and 270.
The answer depends on what the graph is of: the distribution function or the cumulative distribution function.
a) A circle is not the graph of a function. b) A circle is not linear.
If a vertical line, within the domain of the function, intersects the graph in more than one points, it is not a function.
A graph is represents a function if for every value x, there is at most one value of y = f(x).