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This file is specially designed to help you understand the concept of reflection across the y-axis.

Topic: Y- axis or x = 0 Objective:
  • Students will identify the y-axis on the Cartesian plane.
  • Students will understand that all points on the y-axis have x = 0.
  • Students will plot and interpret points lying on the y-axis.
5E Model Lesson Plan:1. Engage (5 mins):
  • Ask: “What happens if you stand at a place where you move only up or down and not sideways?
  • Show a coordinate grid and ask students to guess what x = 0 means.- Use real-life example: Elevator moving up/down without going sideways.
2. Explore (10 mins):
  • Give students graph paper
  • Ask them to plot points like (5, 2), (2, -3), (2, 5),
  • Let them connect the points and observe the vertical line formed.
3. Explain (10 mins):
  • Explain that this vertical line is the y-axis and all points on it have x = 0.
  • Write the equation: x = 0 ⇒ y-axis
  • Label the axes clearly on the board and mark a few points.
4. Elaborate (10 mins):
  • Provide a list of coordinates. Students identify which lie on the y-axis.
  • Use GeoGebra or graphing app to show how the y-axis looks dynamically. (this file already you have )
5. Evaluate :
  • Ask students to: a) Write the definition of y-axis in their own words. b) Plot 3 new points on the y-axis. c) Write 2 properties of y-axis.b
Quick Quiz: 1. What is the x-value of any point on the axis. Is (0, -5) on the y-axisBy : Rakesh Ghimire