You do not have to. You could use polar coordinates, if you prefer.
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Rene Descartes invented the Cartesian Coordinate System, hence the name, and Ramanujan created the coordinate graph.
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The cartesian coordinate system is the basic coordinate system people are familiar with. If you were to plot a basic X Y graph, where X and Y increase towards infinity, you are graphing in the cartesian coordinate system. There are a few other popular coordinate systems for more advanced math, but they are rarely used by most people. (polar coordinate system is common for some calculus equations)
The Cartesian Coordinate System was discovered by Rene Descartes.
The z axis in the vertical axis in the Cartesian Coordinate System.