
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 the function $f(x)= \frac {\ln x}{a}+x$ has its tangent line at $x=1$ described by the equation $2x-y+b=0$.  
(I) Find the values of the real numbers $a$ and $b$;  
(II) If the function $g(x)=f(x)+ \frac {1}{2}x^{2}-kx$ and $g(x)$ is an increasing function on its domain, find the range of the real number $k$.

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