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12-46.

Graph.

  1. What does it mean if there are coordinates?
    What does that tell you about the dimensions of the coordinate system?

  1. Note that the triangle represents a plane.

    3 dimensional coordinate system, with the following 3 points, 2 backward on the x axis, 3 forward on the y axis, up 2 on the z axis. Line segments connecting the points create a triangle which is shaded.