Stage: 5 Challenge Level: 
The point $P=(x,y)$ has image $P'=(ax+by, cx+dy)$. Draw diagrams
and consider the effect of the transformation on the line $OP$
joining $P$ to the origin.
Interactivities. Vector geometry. Matrix transformations. Rotations. Complex numbers. Compound transformations. Coordinates. Symmetry. Matrices. Reflections.
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