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You need to look at website see what your witting about a good way to if the website has a phone number call and find on on your topic and ask questions about it
The inverse would be y=-1/2x+3 because the inverse is the negative of the function. to make the function negative make the slope negative and keep the y-intercept.
I hope I've helped!
Answer:
Please,I don't get your question & kindly be specific