Explaination please im having a lot of trouble

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x

Pamela has a 30-year, 5.75% mortgage on her $250,000 home. she has been paying on it for 5 years, and has recently hit some financial trouble. if her lender agreed to lower the interest rate on her $231,905.47 balance to 5.5%, what will her new payment be for the remainder of the loan?

What is the logic of a square root algorithm?