
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 the graph of a linear function $y=kx+b$ passes through the point $A(-1,-5)$ and intersects the graph of the proportional function $y=\frac{1}{2}x$ at the point $B(2,a)$, find:<br/>
$(1)$ the coordinates of point $B$;<br/>
$(2)$ the analytical expression of the linear function.

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