# Transformations

• January 27th 2009, 01:31 PM
henryW
Transformations
Quote:

Find the coordinates of the image point when (-4, -3) is rotated 1/4 turn ccw about (0, 0) and then reflected over the y axis.
ANy help is appreciated
• January 27th 2009, 01:44 PM
Plato
The rotation matrix gives:
$\begin{gathered}
x' = x\cos (\theta ) - y\sin (\theta ) \hfill \\
y' = x\sin (\theta ) + y\cos (\theta ) \hfill \\
\end{gathered}$