You start from 0 and then you go to the left 2 units and then 3 down the y axis.
Simple....
you have:
(-15,70) and (5,10)
Using-->>


Using y=mx+b...and any of the coordinates....
70= -3(-15)+b
70=45+b
70=45+b
-45 -45
25=b
y=-3x+25
Thus,your answer.
The answer is The median is 69