When we reflect a point across the "x-axis" it's y-coordinate has to change siginals. Therefore the image of the point is:
[tex]A^{\prime}=(x,-y)[/tex]Applying this to the points:
[tex]\begin{gathered} Q^{\prime}=(2,-1) \\ R^{\prime}=(4,4) \end{gathered}[/tex]When we reflect a point across the "y-axis" its x-coordinate has to change signals.
The image of the points are:
[tex]\begin{gathered} Q^{\doubleprime}=(-2,1) \\ R^{\doubleprime}=(-4,-4) \end{gathered}[/tex]