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**Coordinate System and Graphing Ordered Pairs and Relations**

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**Points on a coordinate plane can be located by using pairs of integers**

Points on a coordinate plane can be located by using pairs of integers. Integers are positive and negative #’s. The coordinate plane consists of the following:

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**a horizontal axis (left to right) which is called the x-axis **

a vertical axis (up and down) which is called the y-axis the origin, (0, 0), where the x- and y- axis cross or intersect

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**4) an infinite set of ordered pairs or points**

4) an infinite set of ordered pairs or points. Points are named by using capital letters and given location by using ordered pairs. The ordered pair corresponds to location on the x- and y- axis.

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For example, Point A is located at (x, y). To graph this point you start at the origin and move to the right (if x is positive) or left (if x is negative). Then, from that location, move up (if y is positive) or down (if y is negative). Place a point on the coordinate plane and label with the capital letter, A.

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**5) four regions called quadrants.**

Quadrant I: (+x, +y) Quadrant II: (-x, +y) Quadrant III: (-x, -y) Quadrant IV: (+x, -y)

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**A point is located in or on:**

Q1, Q2, Q3, Q4, origin, x-axis, or the y-axis (Most textbooks or handouts only ask which quadrant. You need to choose from the above 7 locations.)

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**Practice (If you have the Internet, check out some of these websites**

Practice (If you have the Internet, check out some of these websites. We will probably look at some in class too.) lhttp://www.math.com/school/subject2/practice/S2U4L1/S2U4L1Pract.html

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