6-2: Reflection
Reflection in the
Coordinate Plane:
What
is
Reflection?
over the x-axis:
(x, y) (x, -y)
over the y-axis:
(x, y) (-x, y)
1/30/15
To reflect a figure
over the x-axis,
multiply the ycoordinate by -1.
To reflect a figure
over the y-axis,
multiply the xcoordinate by -1.
a
A reflection is a
mirror
of
the
original figure.
What is a Line of
Reflection?
It is the result of a
transformation of a
figure over a line
called a line of
reflection.
Example 1-2a:
Page 463:
Summary:
Triangle PQR has vertices
P(5, 1), Q(3, 7), and R(4,
-1). Graph the figure and
its reflection over the yaxis.
Then find the
coordinates
of
the
reflected image.
Example 3b:
Page 464
Summary:
The figure at right is
reflected over the xaxis.
Find the
coordinates of point
A’ and point B’.
Then sketch the
image
on
the
coordinate plane.

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