Plz answer will give brainliest and thank you also 5 stars

Ineed on this question me get the answer

How does the graph of y = 3x compare to the graph of y = 3-x?

Masons cell phone company charges $0.12 for every text message he sends plus $2.50 per month if mason sent 25 messages this month how much money does he owe the one with the correct answer and explanation gets 10 points and is marked as the brainliest answer