
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 that the polar coordinate equation of curve C is ρ - 4sinθ = 0. Establish a rectangular coordinate system with the pole as the origin and the positive half of the polar axis as the x-axis. Line l passes through point M (1, 0) with a slope angle of $\frac {3}{4}π$.
(I) Find the rectangular coordinate equation of curve C and the parametric equation of line l;
(II) If line l intersects curve C at points A and B (with point A to the right of point B), find $|MA| - |MB|$.

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