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Graphing using a Cartesian Plane

Graphing using a Cartesian Plane. Vocabulary. Cartesian Plane - named after the mathematician Rene Descartes (1596 - 1650), is a plane with a rectangular coordinate system that associates each point in the plane with a pair of numbers. Famous for saying, “I think, therefore, I am.”.

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Graphing using a Cartesian Plane

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  1. Graphingusing a Cartesian Plane

  2. Vocabulary • Cartesian Plane - named after the mathematician Rene Descartes (1596 - 1650), is a plane with a rectangular coordinate system that associates each point in the plane with a pair of numbers. • Famous for saying, “I think, therefore, I am.”

  3. Coordinates - A unique ordered pair of numbers that identifies a point on the coordinate plane. The first number in the ordered pair identifies the position with regard to the x-axis while the second number identifies the position on the y-axis • Graph - A visual representation of data that displays the relationship among variables, usually cast along x and y axes. • Origin – the point (0,0) - where the X axis and Y axis cross.

  4. Quadrants • There are 4 quadrants (big surprise) marked with Roman Numerals I, II, III, IV. • They are numbered Counter Clockwise starting with the upper right.

  5. Quadrants

  6. Plotting Points • (x,y) is how we write Coordinate Pairs. • X always comes first. Always! • When graphing, Go over, then up. • Remember, walk over to the ladder then climb. If you climb then go over…You FALL!

  7. Plotting Points (2,5,) (-4,7) (-5-2) (6,-4)

  8. Interactive Lesson Time! • Pick 2 numbers between 1 and 20. • Randomly make one, both or none of them negative. • Graph them here.

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