How to find b in slope intercept form with two points given

Find the value of the variable and the length of each secant segment.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.