
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
$(1)$ Solve the system of equations $\left\{\begin{array}{l}2x-y=-4\\ 4x-5y=-23\end{array}\right.$; <br/>$(2)$ Simplify first, then find the value: $\left(x-3y\right)^{2}-\left(2x+y\right)\left(y-2x\right)$. Given $x=2$ and $y=-1$.

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