Hi please answer ASAP please and thank you

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

Solve x+3y=6 and 4x-6y=6 by elimination . show work !