Determine whether the graph is that of a function. An open circle indicates that the point does not belong to the graph.

Answer:
yes it is not a function because when a straight line is drawn it cuts the circles two points .
A circle is a curve sketched out by a point moving in a plane. This is a circle not an open circle of a function.
A circle is a curve sketched out by a point moving in a plane so that its distance from a given point is constant; alternatively, it is the shape formed by all points in a plane that are at a set distance from a given point, the centre.
The given graph of the circle is not of a function this is because an open circle is at a point at a particular value of x or y, while a circle intersects a line at two points. Hence, this is a circle not an open circle of a function.
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