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Three
' -6 ' and ' 6 ' are not points. On a 2-dimensional (flat) graph, you need two coordinates to locate one point. (On a 3-dimensional (solid) graph, you need three coordinates to locate one point. And there's no such thing as a 1-dimensional graph.)
either the x plane or the y plane by themselves is one dimensional. Also any intersection of the x and y planes as described as sets or by an equation are one dimensional. In order to become three dimensional an intersecting plane, such a "z" plane would have to be added.
three dimensional
A line graph.