SOLUTION: Investment: $20,000 Annual Income: $1,280 x = T-Bills, 5% yeild y = T-Bonds, 7% yeild z = Corp Bonds, 9% yeild amount invested in t-bills must be 2 times th

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations -> SOLUTION: Investment: $20,000 Annual Income: $1,280 x = T-Bills, 5% yeild y = T-Bonds, 7% yeild z = Corp Bonds, 9% yeild amount invested in t-bills must be 2 times th      Log On

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Question 490790: Investment: $20,000 Annual Income: $1,280
x = T-Bills, 5% yeild y = T-Bonds, 7% yeild z = Corp Bonds, 9% yeild
amount invested in t-bills must be 2 times the amount invested in Corp Bills.
Find the amount in each investment.
I have two of the three equations:
x+y+z= 20,000
5x+7y+9z=128,000
What would the third equation be?
Answer by stanbon(57962) About Me  (Show Source):
You can put this solution on YOUR website!
Investment: $20,000 Annual Income: $1,280
x = T-Bills, 5% yeild y = T-Bonds, 7% yeild z = Corp Bonds, 9% yeild
amount invested in t-bills must be 2 times the amount invested in Corp Bills.
Find the amount in each investment.
I have two of the three equations:
x+y+z= 20,000
5x+7y+9z=128,000
What would the third equation be?
y = 2*z
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Cheers,
Stan H.