(Extension) The equation of a plane in 3D

In the input line type the equation [b]x−2y+4z=4[/b] and press enter.
Why is the equation [math]x-2y+4z=4[/math] represented as a plane when it is plotted in 3-dimensional ([math]x,y,z[/math]) space?
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– GeoGebra Institute of MEI

Information: (Extension) The equation of a plane in 3D