Word problems confuse me >_>

You are choosing between two long-distance telephone companies. Company A charges $.09 per minute plus $4 monthly fee. Company B charges $.11 per minute with no monthly fee.
X = number of minutes you call long distance
y = total cost of long distance phone service.
How am I suppose to write two equations representing the cost of each company's service for one month?

Just take each sentence and figure out what is says algebraically.

Company A: for x minutes, the charge is 9x + 400 cents

Company B: for x minutes, the charge is 11x with no extra fee.

So, which company is cheaper? That obviously will depend on the number of minutes you use.

So, when will A charge more than B?

9x + 400 > 11x
400 > 2x
200 > x

So, if you use less than 200 minutes, A charges more.

At 200 minutes,

9*200 + 400 = 1800+400 = $22.00
11*200 = $22.00

If using more than 200 minutes, A only charges an extra 4 cents/min, while B charges 11 cents/min, so A will be cheaper.

The cell phone bill has a base fee of $30 per month plus twenty cents per minute.

To write two equations representing the cost of each company's service for one month, you need to consider the given information about the charges.

For Company A:
Remember that they charge $0.09 per minute plus a $4 monthly fee. So, the equation representing the cost of Company A's service for one month can be written as:
𝑦 = 0.09𝑥 + 4, where 𝑦 represents the total cost and 𝑥 represents the number of minutes you call long distance.

For Company B:
They charge $0.11 per minute with no monthly fee. In this case, the equation representing the cost of Company B's service for one month can be written as:
𝑦 = 0.11𝑥

These two equations will give you the cost (𝑦) for each company's service based on the number of minutes (𝑥) you use for long-distance calls.