What is the point-slope equation of a line with slope -3 that contains the point (-8,-4)?

Shiny white dental insurance costs $258 per year. approximately one-third of insured people need a filling, which averages $110 each. 80% of insured people get a preventive check-up each year, and the average cost of this visit is $95. if you consider shiny white’s income and expenses, what is the expected value of each insured customer?

Need on this one asap im almost done with this subject

How to use order of operation in 20 divide by 4 multiply 5 = 1