SOLUTION: 2. Solve the following systems of equations by elimination. Verify the solutions. a. r + 2s + 1 = 0 r + 5s + 28 = 0 b. 4m - 3n = 27 8m

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Question 1018939: 2. Solve the following systems of equations by elimination. Verify the solutions.
a. r + 2s + 1 = 0
r + 5s + 28 = 0

b. 4m - 3n = 27
8m - 6n = 18

c. 0.6x = 1.2 + 0.3y
2.2x - 1.8y - 1.6 = 0

3. Frank has $8 000 that he plans to split into two investments. He wrote the following two equations to represent the interest he will earn from each of the two investment options.
� 2000A + 6000B = 520
� 4000A + 4000B = 480
Determine the interest rates, A and B, as percentages.

Answer by FrankM(1040) (Show Source):
You can put this solution on YOUR website!

r + 5s + 28 = 0
r + 2s + 1 = 0 subtract from first equation.
3s+27=0
s=-9
r + 2(-9) + 1 = 0
r -18+1 =0
r=17

SOLUTION: 2. Solve the following systems of equations by elimination. Verify the solutions. a. r + 2s + 1 = 0 r + 5s + 28 = 0 b. 4m - 3n = 27 8m - 6n = 18 c