
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 a certain city, the water supply fee standards are as follows: for each household, if the monthly water usage does not exceed 4 tons, the cost per ton is 1.80 yuan; if the water usage exceeds 4 tons, the excess is charged at 3.00 yuan per ton. In a certain month, households A and B together paid a water fee of y yuan, with their respective water usage amounts being 5x and 3x (in tons).

(1) Find the function y in terms of x;
(2) If households A and B together paid a water fee of 26.4 yuan that month, find their respective water usage amounts and water fees for that month.

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