3. Write the equation of the line for each of the following linear equations on the graph below. its the one with the graph

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Which one ? is the answer and how to find this answer

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.