SOLUTION: Martha Goshaw wishes to place part of $12,000 into a savings account earning 8% simple interest and part of it into a savings account earning 7.25% simple interest. How much should

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Question 1098846: Martha Goshaw wishes to place part of $12,000 into a savings account earning 8% simple interest and part of it into a savings account earning 7.25% simple interest. How much should she invest in each if she wishes to earn $900 in interest for the year.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
X - the amount at 8%
Y - the amount at 7.25%
.
.
1.X%2BY=12000
2.8X%2B7.25Y=90000
Multiply eq. 1 by 8 and subtract from eq. 2,
8X%2B7.25Y-8X-8Y=90000-96000
-0.75Y=-6000
Solve for Y then use either equation to solve for X.