PLEASE HELP ME For which segment lengths is AC¯¯¯¯¯ parallel to DE¯¯¯¯¯ ?
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Since the lines are parallel and you know the slope of 
is -2, you know the slope of line 
will also be -2. You can see on the coordinate grid that line crosses the y-axis at -1. When you piece all of these facts together into slope-intercept form you get = -2x - 1.