word problem

[lmf0610]

If $3000 is invested at 6% annual simple interest, how much should be invested at 9% anual simple interest so that the total yearly income from both investments is $585?

How do I set this up in to an expession.......

 

[tkhunny]

Name Stuff.

X = How much to invest at 9%

$3000*0.06 + x*0.09 = $585