Question 193396
let x and y be the amounts invested at 5 and 8% respectively
:
x+y=20000...............eq 1
.05x+.08y=1210..........eq 2
:
rewrite eq 1 to x=20000-y and plug this into eq 2
:
.05(20000-y)+.08y=1210
:
1000-.05y+.08y=1210
:
.03y=210
:
y=7000 dollars invested at 8%
:
x=20000-y=20000-7000=13000 invested at 5%