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Assume we want to find the ordered pair after 90° counterclockwise rotation. From (x,y), we have (-y,x). If we want to find the ordered pair after 90° clockwise rotation, then from (x,y) we have (y, -x)
If the reflection is over the x value, the x-value does not change.
The x coordinate.
A "Cartesian Ordered Pair," more commonly known as simply an "Ordered Pair."
x-axis