Order of operations using "gemdas" the answer is 4 just need on how to solve it (step by step)

You work for a lender that requires a 20% down payment and uses the standard depth to income ratio to determine a person‘s a little eligibility for a home loan of the following choose the person that you would rate the highest on their eligibility for a home loan

Find the equation using the point (4,8)

Ineed with math stuff it involves graphs