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RE: BTC - Bounce confirmed from our Support Line
The yellow line is a trend line. You draw trend lines connecting two or three lows and project the line in the future. You can also connect highs. In this case, some lows where connected. Technical Analysis states trend lines connecting lows can act as a support keeping price from going down. And trend lines connecting highs can act as a resistance keeping the price from going up.
I know what a trendline is, with what probability can it be broken?
That is the million dollar question!
As a general rule, all you can tell is the more times a trend line is touched, the more probabilities it has to be broken.