Find all real solutions to the system of equations using the substitution method.x2 + y2 = 41x + y = 9
A. (5, -4), (4, -5)
B. (-5, 4), (-4, 5)
C. (5, 4), (4, 5)
D. (-5, -4), (-4, -5)
Answer: C
Mathematics
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Find the indicated matrix.Let A = 
and B = 
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A. 
B. 
C. 
D. 
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Solve the equation.5(2x - 1) = 20
A. 
B. 
C. 
D. 
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Find the matrix product, if possible.
A. 
B. 
C. 
D. Does not exist
Mathematics