I can solve just need assistance with setting the formula up correctly. Phoenix inherits $12,000.

Could I please get help on the formula for this word problem. I can solve just need assistance with setting the formula up correctly.

Phoenix inherits $12,000. He decides to invest part of the inheritance in a mutual fund and the remaining part in a CD. If the amount invested in the CD is $3,000 more than 8 times the amount invested in the mutual fund, find the amount invested in each account.