The Coordinate System Locating Points Plotting Points Intro to Algebra.

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The Coordinate System Locating Points Plotting Points Intro to Algebra

Transcript of The Coordinate System Locating Points Plotting Points Intro to Algebra.

Page 1: The Coordinate System Locating Points Plotting Points Intro to Algebra.

The Coordinate SystemLocating PointsPlotting Points

Intro to Algebra

Page 2: The Coordinate System Locating Points Plotting Points Intro to Algebra.

Coordinate Plane

Page 3: The Coordinate System Locating Points Plotting Points Intro to Algebra.

Coordinate Plane

• Y-Axis – The vertical line in the coordinate plane

• X-Axis – The horizontal line in the coordinate plane

• Coordinates – The x-values and the y-values• Origin – The point where the x-axis and the y-

axis meet.

Page 4: The Coordinate System Locating Points Plotting Points Intro to Algebra.

Naming Points

You can use two numbers to name every point in the plane. These two numbers are called an ordered pair.

(x,y)

– Think alphabetically! We always write the x value first and then the y value

Page 5: The Coordinate System Locating Points Plotting Points Intro to Algebra.

Plotting Points

• Think of the coordinate points as directions of how to get to the point from the origin.

• X-Value tells you how far to go left or right– Positive = Right– Negative = Left

• Y-Value tells you how far to go up or down– Positive = Up– Negative = Down

Page 6: The Coordinate System Locating Points Plotting Points Intro to Algebra.

Naming Points

Page 7: The Coordinate System Locating Points Plotting Points Intro to Algebra.

What if they are on an axis?

• Points on the x-axis– The y-value for points on the x-axis is 0

• Points on the y-axis– The x-value for points on the y-axis is 0

Page 8: The Coordinate System Locating Points Plotting Points Intro to Algebra.

Naming Points

Page 9: The Coordinate System Locating Points Plotting Points Intro to Algebra.

Plot Points

1. A (3,2)

2. B (1/2, -2)

3. C (0, 3)

4. D (-2, 0)