
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given a moving point M on a plane, the distance from M to the line $y = -2$ is 1 more than its distance to the point F(0, 1).  
(Ⅰ) Find the equation of the trajectory of point M;  
(Ⅱ) Suppose the curve formed by the moving point M is E, and a line $l$ passing through point P(0, -1) intersects curve E at points A and B. If the sum of the slopes of lines OA and OB is 2 (where O is the origin), find the equation of line $l$.

Present the answer in LaTex format: \boxed{Your answer}
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