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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 Click here to see ALL problems on Linear Equations And Systems Word Problems 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)   (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 ================ Cheers, Stan H.