Question 908190
Here, we see that Ingrid has two separate CD accounts, one paying 8 % and the other paying 9%. Her annual interest is $2 020. She's got two accounts totaling 
$ 24 000 .

This is a money problem with a systems of equations solution :

0.08 x+ 0.09y = 2 020  (a)
x+y= 24 000           (b)

Multiply (a) by 100 to get rid of the decimals.

8x+9y = 202 000         (c)

Multiply (b) by -8 

-8x-8y = - 192 000      (d)

Now, we can add (c) and (d) to get

y= 10 000

Plug y= 10 000 into  x+y = 24 000
                     x+ 10 000 = 24 000
                     x         = 14 000

To check:

0.08 x + 0.09 y=
0.08 (14 000) + 0.09 ( 10 000)=
1120 + 900 = 2020 

So, Ingrid invested $14 000 in the  8% annual CD and $ 10 000 in the 9% annual CD account to generate $ 2020 annual interest.