
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 $y+m$ is directly proportional to $x-n$ (where $m$ and $n$ are constants),

(1) Is $y$ a first-degree function of $x$? Please judge and explain the reason;

(2) If $y=-15$ when $x=-1$, and $y=1$ when $x=7$, find the functional expression of $y$ with respect to $x$.

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