
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
In the Cartesian coordinate system, the coordinates of the three vertices of triangle ABC are $A(2,-2)$, $B(6,6)$, and $C(0,6)$.  
$(Ⅰ)$ Let the midpoint of segment $AB$ be $M$, find the equation of the median line $CM$.  
$(Ⅱ)$ Find the equation of the line containing the altitude on side $AB$.

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