Ti'Nazia

I have find the function rule for this problem x=0,2,4,6 y=1,5,9,13

I need help on finding the median, and I'm not quite getting it. Question : Find the median of 3,6,7,9,9,10 I am thinking 8 because 7+9= 16 ---- 2 So, I am diving 16 by 2 which is 8. It is one of my answer choices though. Thanks