Math Insight

Applet: A point or a line

Applet: A point or a line

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The graph of the equation $x=3$ could be a point, if it were an equation in one variable. But, in this case, it is an equation in two dimensions, in the variables $x$ and $y$ (where the coefficient of $y$ just happens to be zero). Rotate the figure by moving the blue point on the slider to the left to see that, since it is a graph in two dimensions, the graph is really a line.

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General information about three.js applets

The applet was made using three.js and requires Javascript as well as a browser that supports WebGL. For most three.js applets, you can drag with the mouse to rotate the view, drag with the right button to pan, and zoom in/out with the mouse wheel. Many applets contain points that you can drag to change values of variables.