Solve the system by the addition method.
A. {(2, 1), (2, -1), (-2, 1), (-2, -1)}
B. {(2, 1), (-2, -1)}
C. {(1, 2), (-1, 2), (1, -2), (-1, -2)}
D. {(-1, 2), (1, -2)}
Answer: A
Mathematics
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A. 7 + 6n5 + 9n3 B. 8n5 + 4n3 + 10 C. 7n5 + 6n3 + 9 D. 22n8
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Provide an appropriate response.Simplify: 
A. 9
B. 5
C. 3
D. 3
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Simplify.-8(2x - 4y) - 3(-x + 2y)
A. -13x + 26y B. 8x + 26y C. -13x + 2y D. -12x + 27y
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Use the Gauss-Jordan method to find A-1, if it exists.A = 
A. 
B. 
C. 
D. Does not exist
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