Help please.
Algebra

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

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.

Is the power produced directly proportional to the wind speed, give reasons for your answer?