If you are talking about the things in the perentheses, (5,-9), they are called ordered pairs. Ordered pairs help you find a location on a coordinate graph.
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In a euclidean graph, the position of a point on the graph is denoted by its Coordinates (x,y).
The number are called coordinates.
It is where the x and y coordinates intersect.
Is called the origin and has coordinates (0,0).Origin(0,0)
a "circle graph" is also a polar graph, it's used to graph polar coordinates.