Question 156068
.09x+.07(5,000-x)=370
.09x+350-.07x=370
.02x=370-350
.02x=20
x=20/.02 
x=$1,000 invested @ 9%.
5,000-100=4,000 invested @ 7%
Proof:
.09*1,000+.07*4,000=370
90+280=370
370=370