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The Cartesian PLane Lets start graphing!. Introduction to x-y plane You learned about the basic (counting) number line back in elementary school: Later.

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Presentation on theme: "The Cartesian PLane Lets start graphing!. Introduction to x-y plane You learned about the basic (counting) number line back in elementary school: Later."— Presentation transcript:

1 The Cartesian PLane Lets start graphing!

2 Introduction to x-y plane You learned about the basic (counting) number line back in elementary school: Later on, you were introduced to zero and negatives, which completed the number line:negatives

3 Descartes' breakthrough was in taking a second number line, standing it up on its end, and crossing the first number line at zero:

4 Ordered Pairs An 'ordered pair' is simply two numbers in a certain order. For example, the numbers '2' and '3' can form two ordered pairs: 2, 3 and 3, 2 In mathematics, we use two numbers to accurately locate a position on a rectangular grid, like this:

5 Coordinate system On a graph grid, the point (0,0) is called the ' origin ' The first coordinate of a plotted point is called the ' x ' coordinate The second coordinate of a plotted point is called the ' y ' coordinate origin X coordinate y coordinate

6 Lets Graph (2, 4) (-4, 3) (-5, -4) (3, -3) (2, 4) (-4, 3) (-5, -4) (3, -3)

7 Your turn: which quadrant will the point lie? (2, -3) (-2, -1) (5, -5) (-2, 1) (1, 5)


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