If I will be given a chance to go back to the past and meet a person, I will choose to meet Rene Descartes.  Rene Descartes is the one who invented the Cartesian plane. If I will meet him, I am going to discourage him to invent the Cartesian plane and I will explain him why. I will tell him that it is one of the things that make the life of the high school students miserable. I will also ask him the reason why did he invent it. If he refuses to do what I say and continue to invent the Cartesian plane, I will ask him to teach me the concepts and important details to remember about it. If I am given more time, I want to see what happened after. After that, I will thank him and says goodbye.