Given the coordinates Points of the pre-image us the transformation given to provide the points of the image

When a 270° counterclockwise rotation, a coordinate that is (x,y) it becomes (y, -x), this is done by switching the coordinates and making the x negative.
[tex](X,Y)\Rightarrow(Y,-X)[/tex][tex]\begin{gathered} J(-4,3)\Rightarrow J^{\prime}(3,4) \\ K(-3,3)\Rightarrow K^{\prime}(3,3) \\ L(-3,2)\Rightarrow L^{\prime}(2,3) \end{gathered}[/tex]