Shares of General Motors (GM) could be opening up a bullish trend. In the previous update, we marked the 35.00 price level as a critical resistance for GM.GM Weekly Chart(click to enlarge)Triangle Breakout:- As we can see in the weekly chart, price has been consolidation in a multi-year triangle.- Last week, price broke above key resistance at 35.00. - This resulted in a break of a triangle resistance, which opens up the 41.85 high from 2013.- If price retreats, price should hold above 33-34 area. Otherwise, this current bullish breakout could be a false one.