
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 point $P(-3a-4,2+a)$, solve the following questions:<br/>$(1)$ If point $P$ lies on the $x$-axis, find the coordinates of point $P$;<br/>$(2)$ If $Q(5,8)$ and $PQ$<span class="special-symbol">∥</span>$y$-axis, find the coordinates of point $P$.

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