趋势线 (trend lines)

hello mouteki !!!!
first of all i want to tank you for you'r effort to make us a better trader's.

i have difficulty to understand some of your example's that you made in the powerpoint about choosing the right trend line point's
i mean why did you choose demand line and not supply see the attach files.

tank's moshe
p.s
i'm sory for my bad english