
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 intersects the graph of a direct proportion function at point M, and intersects the x-axis at point N (-6, 0). It is also known that point M is located in the second quadrant with an x-coordinate of -4. If the area of $\triangle MON$ is 15, find the equations of the direct proportion function and the linear function.

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