
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 2010, the southwestern region of our country suffered a once-in-a-century drought. However, due to the construction of a "forest city" in recent years, one city was less affected by the drought. According to statistics, the city planted 500 million trees in 2009, conserving 300 million cubic meters of water. If the city continues to plant 500 million trees annually, the construction of the "forest city" will be fully completed by 2015. By then, the trees will be able to sustainably conserve 1.1 billion cubic meters of water.
(1) How many billion trees will the city have planted in total from 2009 to 2015?
(2) Assuming 2009 as the first year, let the water conservation capacity of the trees $y$ (in billion cubic meters) be a linear function of the year $x$. Find the equation of this function and calculate how much water can be conserved by the third year (i.e., 2011)?

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