Find all real solutions to the system of equations using the substitution method. xy = 90x + y = -19
A. (9, 10), (10, 9)
B. (-9, -10), (-10, -9)
C. (-9, 10), (-10, 9)
D. (9, -10), (10, -9)
Answer: B
Mathematics
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A. 
, 1, 1, 
B. 
, 
, 
, 
C. 1, 
, 
, 
D. 
, 
, 
, 
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Triangle PAC is rotated 120° counterclockwise about the rotocenter P. The image is
A. triangle PDE. B. triangle PGO. C. triangle POA. D. triangle PCD. E. none of these
Mathematics
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A. i B. -1 C. -i D. 1
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A. Imaginary B. Real
Mathematics