### Home > PC > Chapter 10 > Lesson 10.2.1 > Problem 10-68

10-68.

Have you ever thought of how to graph in three dimensions? The - and

*-axes are the same as usual and we generally think of them as lying in a horizontal plane. The*

*-axis goes through the origin and is perpendicular to the plane. (We generally think of it as being vertical.)*

To get ready for graphing parametric equations in three dimensions, complete the following problems.

Draw the

- and- axes in the plane.On your paper, mark the points with coordinates

and . Now imagine the

-axis going up from the origin. Why is the point with the 3-dimensional coordinateone of those you have already marked? Place the tip of your pencil at the location where the points

, , , and would be. One of the points in part (d) was below the paper. Which one?