1-5 Activity #1
Directions: Perform each transformation and record the coordinates of the image. Determine a general coordinate rule.
1.) Reflect over the y-axis.
The pre-image was A(-6,0) B(2,4) and C(-2,-2). Identify the coordinates of the image.
A'(-6,0) B'(-2,4) C'(2,-2)
What is the general coordinate rule for a reflection over the y-axis?
(-x, y)
2.) Rotate 90 degrees counterclockwise.
The pre-image was A(0,3) B(1,2) and C(4,3). Identify the coordinates of the image.
A'(-3,0) B'(-2,1) C'(-3,4)
What is the general coordinate rule for a rotation 90 degrees counterclockwise?
(-y, x)
3.) Translate right 5 units and up 2 units.
The pre-image was A(-4,-2) B(-3,2) and C(-2,-2). Identify the coordinates of the image.
A'(1,0) B'(2,4) C'(3,0)
What is the general coordinate rule for translating a figure right [i]a[/i] units and up [i]b[/i] units?
(x+a, y+b)
4.) Reflect over the y=x line.
The pre-image was A(-4,2) B(0,6) and C(-4,-2). Identify the coordinates of the image.
A'(2,-4) B'(6,0) C'(-2,-4)
What is the general coordinate rule for reflecting across the y=x line?
(y, x)
5.) Rotate 180 degrees.
The pre-image was A(-4,-2) B(-3,2) and C(-2,-2). Identify the coordinates of the image.
A'(1,0) B'(2,4) C'(3,0)
What is the general coordinate rule for rotating 180 degrees?
(-x, -y)
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Information: 1-5 Activity #1