Write the appropriate rotation formulas so that in a rotated system the equation has no x'y'-term.3x2 + 2xy + 3y2 - 8x + 8y = 0
A. x = -y'; y = x'
B. x = 
x' - 
y'; y = 
x' + 
y'
C. x = 
x' - 
y'; y = 
x' + 
y'
D. x = 
(x' - y'); y = 
(x' + y')
Answer: D
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