The point in original figure is:
[tex](4,1)[/tex]
A rotation of 90 degrees clockwise is given by:
[tex]\begin{gathered} x^{\prime}=x\cos (90)+y\sin (90)=y \\ y^{\prime}=-x\sin (90)+y\cos (90)=-x \end{gathered}[/tex]
Therefore, the final point is:
[tex](4,1)\to(y,-x)=(1,-4)[/tex]
