Mathematics
Grade9
Easy

Question

Find the image coordinates of the line AB, if A (6, 4) and B (6,1), which is reflected along y = -x

  1. A’( 4, 6), B’( -1, 6)
  2. A’( 4, 6), B’( 1, 6)
  3. A’( 4, 6), B’( 1, -6)
  4. A’( -4, -6), B’( -1, -6)

hintHint:

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

The correct answer is: A’( -4, -6), B’( -1, -6)


    * 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 (6, 4) and B (6,1), which is reflected along y = -x
    >>>Let, (a, b) be a point on the x-y plane. Then, the points of reflection with respect to y=-x becomes (-b,-a).
    >>>Therefore, the points of reflection for A (6, 4) and B (6,1) with respect to y=-x becomes:
    A'(-4,-6); B'(-1,-6).

    If (a, b) is reflected in the line y = -x, its image is the point (-b, -a).
    (a, b) → (b, a)
    A(6, 4) → A’(-4, -6)
    B (6,1) → B’(-1, -6)
    Image of the line A’( -4, -6), B’( -1, -6)

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