Mathematics
Grade9
Easy

Question

Find the image coordinates of the line AB, if A (3, 2) and B (5, 2), which is reflected along y -axis.

  1. A’ (2, -3), B’ (2, -5)
  2. A’ (-3, -2), B’ (-5, 2)
  3. A’ (2, -3), B’ (-2, -5)
  4. A’ (2, -3), B’ (2, 5)

hintHint:

Plot the given points on the graph and then obtain the points of reflection.

The correct answer is: A’ (-3, -2), B’ (-5, 2)


    * In Geometry, a reflection is known as a flip. A reflection is a mirror image of the shape. An image will reflect through a line, known as the line of reflection.
    *It is a type of transformation that produces mirror image of the shape.
    The reflection transformation can be done in many ways.
    *Reflection over X-axis
    *Reflection over Y-axis
    *Reflection over Y = X
    Given That:
    The image coordinates of the line AB, if A (3, 2) and B (5, 2), which is reflected along y -axis.
    >>>Let, (a, b) be a point on the x-y plane. The, the point of reflection with respect to y-axis becomes (-a, b).
    >>>Therefore, the point of reflection for the given points A(3,2) and B(5,2) becomes with respect to y-axis:
      A'(-3,2);B'(-5,2).

    If (a, b) is reflected in the y-axis, its image is the point (-a, b).
    A (3, 2) → A’ (-3, 2)
    B (5, 2) → B’ (-5, 2)
    Image of the line A’ (-3, 2), B’ ( -5, 2)

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