What is the slope of a line parallel to 3x+y=7

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.

I’m really confused and need your assist me with this question i’ve never been taught

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)