Math with Mr. Jay: Plotting Points on a Coordinate Plane

Introduction

• Focus on how to plot points on a coordinate plane.
• Coordinate Plane Basics:
  • X-Axis: Horizontal (side to side).
  • Y-Axis: Vertical (up and down).

Key Concepts

• Ordered Pair: Written as (x, y).
  • X-Coordinate: Comes first in the pair.
  • Y-Coordinate: Comes second.
• Origin: The starting point (0, 0).

Steps to Plot Points

1. Identify the Ordered Pair: Always start with the x-coordinate.
2. Move Horizontally: Based on the x-coordinate.
3. Move Vertically: Based on the y-coordinate.
4. Plot the Point: Mark the intersection.

Examples

Example 1

• Coordinates: (4, 7)
  • Move 4 units right on the x-axis.
  • Move 7 units up on the y-axis.
  • Plot: Point at (4, 7).

Example 2

• Coordinates: (3, -9)
  • Move 3 units right on the x-axis.
  • Move 9 units down on the y-axis.
  • Plot: Point at (3, -9).

Example 3

• Coordinates: (-9, 3)
  • Move 9 units left on the x-axis.
  • Move 3 units up on the y-axis.
  • Plot: Point at (-9, 3).

Example 4

• Coordinates: (-5, -6)
  • Move 5 units left on the x-axis.
  • Move 6 units down on the y-axis.
  • Plot: Point at (-5, -6).

Example 5

• Coordinates: (0, -2)
  • Stay on the origin for the x-axis.
  • Move 2 units down on the y-axis.
  • Plot: Point at (0, -2).

Example 6

• Coordinates: (-8, 10)
  • Move 8 units left on the x-axis.
  • Move 10 units up on the y-axis.
  • Plot: Point at (-8, 10).

Additional Tips

• Marks on axes are not necessary for final plots.
• Always check the sequence: X before Y.

Conclusion

• Recap the importance of sequence in ordered pairs.
• Practice plotting to become proficient.

Note: These notes are based on the lecture by Mr. Jay on plotting points on a coordinate plane.