SOLUTION: Please help me with the following equation: 1. Carolyn received a check last week. She invested part at 15%and $1000 more than this at 16%. If she will earn $780 in interest in

Question 625022: Please help me with the following equation:
1. Carolyn received a check last week. She invested part at 15%and $1000 more than this at 16%. If she will earn $780 in interest in a year, how much was invested at each rate?
This is what I have so far:
I=PRT
x= first investment
x+1000 second investment

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
1. Carolyn received a check last week. She invested part at 15%and $1000 more than this at 16%. If she will earn $780 in interest in a year, how much was invested at each rate?
This is what I have so far:
I=PRT
x= first investment
x+1000 second investment
-------------
You can do it that way.
Then,
0.15x + 0.16(x+1000) = 780
0.31x + 160 = 780
x = 2000
----------
$2000 @ 15%
$3000 @ 16%

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