Determine the appropriate rotation formulas to use so that the new equation contains no xy-term.x2 + 2xy + y2 - 8x + 8y = 0
A. x = 
x' - 
y' and y = 
x' + 
y'
B. x = 
x' - 
y' and y = 
x' + 
y'
C. x = 
(x' - y') and y = 
(x' + y')
D. x = -y' and y = x'
Answer: C
Mathematics
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A. 
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C. 
D. 
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