3x + 3y =15 and x = -3y -1

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.

How much orange juice do you need to make 2 servings of lemony orange slush?

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12