A good graph of (sin x) would have x-people from -5 to 5 and y-people from -1 to 1. That is only a 10x2 window, too small to really see anything.
We want to graph the same function in a 300x200 window.
We have a function that takes in people x-coordinates and puts out people y-coordinates, so the infomation will flow as diagrammed below.
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This means figuring out conversion functions.