by two linear equation system the investment in Bonds: $31,500
CD: $25,500 .
Total invested = Amount in bonds + Amount in CDs
Amount in bonds = Amount in CDs + 6000
Let the amount in bonds = B and the amount in CDs = C
1. 57,000 = B + C
2. B = C+6000
these are two linear equation system
57,000 = C + 6000 + C
57,000 = 2C + 6000
51,000 = 2C
25,500 = C
B = C+6000
B= 25,500+6000 = 31,500
Bonds: $31,500
Certificates of deposit: $25,500
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