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big idea 4
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y=x
(x,y) → (y,x)
y=-x
(x,y) → (-y,-x)
90 ccw 270 cw
(x,y) → (-y,x)
90 cw 270 ccw
(x,y) → (y,-x)
180 ccw 180 cw
(-x,-y)
x axis
(x,y) → (x,-y)
y axis
(x,y) → (-x,y)
right
positive (x)
left
negative (x)
up
positive (y)
down
negative (y)