How can you describe a unit rate for a situation

Aline passes through 3,7 and 6,9 what equation represents the line

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?

Melissa is purchasing a $160,000 home and her bank is offering her a 30-year mortgage at a 4.9% interest rate. in order to lower her monthly payment, melissa will make a 20% down payment and will purchase 3 points. what will her monthly mortgage payment be? a. $645.98 b. $650.46 c. $662.93 d. $606.69