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**Lesson for Glencoe Algebra I Math**

The Coordinate Plane By: Stan Blackman Jay High School Lesson for Glencoe Algebra I Math Section 4-1 Algebra I Glencoe Mathematics 2004 The McGraw Hill Companies Inc.

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Vocabulary Words Axes - two perpendicular number lines used for locating points Origin – the intersection of the two axes Y-axis – the vertical number line X-axis – the hoizontal number line

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**The four quadrants of the coordinate plane.**

Y-axis Quadrant I Quadrant II X-axis Quadrant IV Quadrant III

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Signs of the quadrants. Y-axis (+,+) (-,+) X-axis (-,-) (+,-)

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The Ordered Pair (5,10) X- coordinate Y- coordinate

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The Origin Point Y-axis Origin Point (0,0) X-axis

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**Always start at the origin to plot a point.**

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**Direction of Movement for the X-Coordinate**

Y-axis If the x-coordinate is positive move this way If the x-coordinate is negative move this way X-axis

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**Direction of movement for the Y-coordinate**

Y-axis If the y-coordinate is positive move this way If the y-coordinate is negative move this way X-axis

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Name the given point. Y-axis (1,3) (-2,1) X-axis (-5,-1) (4,0)

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**How To Plot a Point on the Coordinate Plane**

Y-axis (4,4) Next move on the Y-axis X-axis (-3,-1) First move out on the X-axis

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