Question 179363
let the amount invested at 7% and 9% be x and y respectively
:
x+y=12000............eq 1
.07x+.09y=970.......eq 2
:
rewrite eq 1 to x=12000-y and plug it into eq 2
:
.07(12000-y)+.09y=970
:
840-.07y+.09y=970
:
.02y=130
:
${{{highlight(y=6500)}}}invested at 9%
:
${{{highlight(x=12000-6500=5500)}}}amount invested at 7%