Good Morning!!!!

my prof solved this but i didn't get it idk T,T

i must use division of a line segment.

"find the endpoint of the section joining A(2,3) & M(6,1) if it is extended to a distance 2/3 fro its own length."

got midterms coming up , this is the only thing that i didn't understand .please help ^^

thanks in advance!!!!