For this problem we know that the image point has a coordinate sof:
[tex]B=(7,-4)[/tex]And we know that the translation used was
[tex](x+4,y+5)[/tex]And for this case we can do this:
[tex]x+4=7\rightarrow x=7-4=3[/tex][tex]y+5=-4\rightarrow y=-4-5=-9[/tex]And then the best solution for this case would be:
B(3,-9)
