
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 $xOy$, $A(1,2)$, $B(-2,3)$, $C(8,-5)$.  
$(1)$ If $\overrightarrow{OC}=x\overrightarrow{OA}+y\overrightarrow{OB}$, find the values of real numbers $x$ and $y$.  
$(2)$ If $\overrightarrow{AB}∥(m\overrightarrow{OA}+\overrightarrow{OC})$, find the value of the real number $m$.

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