• Pick a number for x and put it into the equation. Use that number as the x-coordinate of your point, and use what you get from solving the equation as your y-coordinate of the point. Plot that point. Repeat this process a few more times, and then connect the dots.
  • 8-26-2017 That is called Cartesian plotting because it was invented by Rene Descartes. He was lying in a hospital bed when he noticed a fly crawling on the ceiling. It occurred to him that if the fly's position were determined by an equation relating y and x, then the fly's path would be a picture of that equation. So to plot an equation, you pick a convenient value for x and find the resulting value of y. Then you measure x units along one axis and y units along the other, and mark a point there. It looks like this: Notice that we don't write 1/2x because that is ambiguous. We write (1/2)x or x/2 so it can only be interpreted one way.

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