Prove that (y+6)(y+3)-y^2 is a multiple of 9 when y>0

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

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?

X+y=-4 x-y=2 use elimination with adding and subtraction